Flow woes... not so    12/10/06
I was randomly reading through your marine articles last night with no particular question in mind, when I came upon the articles on flow. I'd never given water movement a ton of thought, except to simply move a whole lot of water around....(quick background....150gal tank, Berlin, 2" live sand, appx. 225lbs live rock, various fish & inverts..... No corals)
  Now, I'm reading about all of the different types of water movement and their pro's & con's, and it seems my set-up, which I now believe to be laminar, has the most cons.
<And to think how happy you were...>
  I have my rock piled up in a lean-to fashion, pyramiding up against the back wall of the tank. I'm using 3 MaxiJet 1200's across the back wall at various heights to push the water from left to right. I'm using 3 more in various positions & depths to "return" the water from right to left across the front of the tank. Now, while I know we cannot really create a cyclone in a rectangle, it just seemed to be the most efficient, but after reading your article, now I'm not so sure. Is there a most efficient placement to try to hit all the "dead spots" and to make sure the most water is filtered through the most rock?
<Mmm... well, "the more the merrier", "cyclonic" designs, randomized... are all good flow properties/characteristics... and if you're fine with your powerhead arrangement, I'd keep it>
Or are the caveats mostly aimed at coral damage, of which I do not have/have to worry about?
<Mmm, yes... more Cnidarians in mind here... though other sessile invertebrates can be caused harm...>
Or am I simply trying to fix something that isn't broken? Thank you my briny friends, I don't know what the captive undersea world would do without you!
  -Pat
<I would leave your arrangement as is... "next tank"... you can devise something different... like a closed-loop device and external pump. Bob Fenner>

Water Flow And Corals 10/16/06
Hi WWM.
<Hi Omar.>
First let me say I love your site it is a database full of useful knowledge.
<Thank you.>
I have a question about water flow. First here is <are> my tank parameters.
75 gallon  
PH 8.3, Ammonia 0, Nitrate <10 ppm, Nitrite 0, PO4 0
Carbonate Hardness 8, Specific Gravity 1.024, Calcium 450ppm
20 gal sump
Berlin protein skimmer for up to 250 gal
Tunze 6100 with single controller
1 Blue Damsel
1 Blue Hippo Tang
1 Kole Tang
1 Clown Tang
1 Fairy Wrasse
2 Tomato Clowns
3 Bubble Tip Anemones...Started with one and it split
Waving hand Coral
Pulsing Xenia
Toadstool Leather
Finger Leather
Green Star Polyps
Unidentified Mushrooms
Pagoda Cup
Chili Coral
Christmas Tree Coral
Yellow Sun Polyps
<The tangs will need a larger home before too long.>
I just added the Tunze 6100 and it seems like to much flow. My Xenias are breaking off the stalk, the toadstool is drooping, and the Finger leather is starting to lay over. On the other hand The Sun polyps, Christmas Tree, and Chili are doing amazing. Is the Tunze to much flow or will the coral get used
<I have no idea what a "youse" is, please explain.>
to the extra flow? How should I set the controller? Any info you give me will be greatly appreciated.
<Hard corals generally prefer higher flow rates, but softies really aren't too happy with it.  The Tunze 6100 specs mention a 105 gallon minimum tank size.  The Turbelle Stream Pump, which is what you have, puts out a ton of water and was not designed as a circulation pump, but for wavemaker use.  I'm not familiar with their controller, or what it is capable of, but if it were me, I try very short bursts of water with about 15-45 seconds of delay between the bursts.  I'd also address your concerns as to pump operation, to Tunze, at this website.  http://www.tunze.com/117.html?C=US&L=1>
Thanks Again,
Omar
<You're welcome.  James (Salty Dog)>
<<Sorry about the "youse".  Did find it in the dictionary, but you are using the word incorrectly.  See here.  "In addition to y'all, other forms for plural you include you-uns, youse, and you guys or youse guys. Youse is common in vernacular varieties in the Northeast, particularly in large cities such as New York and Boston, and is also common in Irish English. You-uns is found in western Pennsylvania and in the Appalachians and probably reflects the Scotch-Irish roots of many European settlers to these regions. You guys and youse guys appear to be newer innovations than the other dialectal forms of plural you." >>

- 10/28/06 Tunze question !
Hi there,
<Howzit?>
What are your thoughts of the Tunze Wave Box ?
<A mighty fine product amongst many from this European manufacturer>
I am in the process of choosing between too many options for my 150 gal circulation, planning to keep SPS and I find that installing a closed loop system is very pricy compared to Tunze streams or wave boxes. Thanks
Ramy
Toronto, Canada
<Is expensive... but worth it IMO. Bob Fenner>

Ocean Motions 4-Way - 10/18/06
Hi Crew,
<<Ramy>>
What is your feedback about the 4-way Oceans Motions device?  Is it really any good?
<<I know several hobbyists who have the Oceans Motions Squirt and think it is wonderful...I also know of one hobbyist who had problems from the start though a "replacement" made things better.  I have a store owner friend who uses these all the time in his custom tank-builds.  The device looks/feels solid and appears well made but seems to me to run a bit "warm" though as I stated, most everyone I know who has one thinks it is great piece of equipment.  Try visiting/posting a question on one of the reef boards (RC or reefs.org) for a broader opinion>>
Thanks,
Ramy
Toronto, Canada
<<Quite welcome.  EricR>>

Water Movement/First SPS - 10/13/06
Hello,
<<Howdy>>
I would like to try some SPS corals.  I have kept leathers, torch and hammer corals for a few years now along with some Xenia so I think I would like to graduate to some SPS now.
<<Please do try to research the individual species you are interested in for their care requirements>>
I just added 2 Tunze Turbelle 6060 to my 125 gallon reef.
<<Great pumps>>
They are set about half way up the side set diagonally to intersect the return from my sump with is from a 1500gph pump.
<<Sounds good>>
Is this too much flow?
<<You tell me...how are your corals reacting?  But generally speaking no, I don't think it is too much flow if applied correctly>>
The Turbelle pumps are rated at 1600gph each.  My leather corals, Torch etc. are all opened and seem fine.
<<Ah...well there's your answer then...>>
The fish seem to enjoy it.
<<Indeed they do>>
Additionally what SPS can you recommend for my first endeavor... Thank You,
John
<<Hmm...the fact you have noxious soft corals and aggressive LPS already in the tank puts you at a disadvantage already in my opinion.  Not that mixing families/species of coral can't be/isn't done...but it does make keeping all happy more challenging...and difficult in the long term.  But that aside, give your hand a try with some Montipora digitata.  This SPS coral can be found in varying colors and is a bit more "forgiving" in terms of environment/care than many of the Acropora species, in my opinion.  Regards, EricR>>

Circulation Upgrade - 10/03/06
I have a 90 gallon Oceanic bowfront tank, and want to upgrade my circulation.
<<An always worthwhile and oft overlooked upgrade in my opinion>>
I currently have (2) Rio 2500 powerheads in the tank (for circulation only), and the return from my sump is 900 GPH, split with a tee in to two Lock-Lines.
<<Some good flow>>
I want to get rid of the Rio pumps in the tank, and I am debating between the following scenarios:
1. (2) Tunze 6060 powerheads (1600 GPH each), placed at opposite ends of the tank
2. (1) Tunze 6000 powerhead (1850 GPH) with a 7091 speed controller
The 6060 powerheads cannot be speed controlled, but provide more overall flow volume from multiple locations.  The 6000 would cycle at different flow rates, and has a night-mode and feeding-mode.   The tank will contain 125 pounds of live rock, soft corals, LPS, and a few fish.  The return pump from the sump is an Ocean Runner 3500, which is rated at 900 GPH.  Which of the powerhead systems do you think would be a better for my tank?
<<Considering the size of the tank and the livestock you intend to keep I would opt for the 6000.  I really like the electronic Tunzes...position this one opposite/meeting your sump return with about a 6-second pulse (max. 100-percent/min. 30-percent) and you'll be golden>>
Thank you,
Steve Lasik
<<A pleasure to assist.  Eric Russell>>

Closed Loop Manifold...Where Does The Water Go?  9/26/06
Hi once more.
<Hello again.>
I sent you a note last night about a closed loop manifold and in the meantime have continued to research this project. As I read all these articles on the web about the system, I'm not seeing one thing mentioned. If I'm putting 3000gph into my tank, how the heck does it get out? I'm running the biggest CPR overflow on my tank and it's rated at 1600 and is getting no where near that flow rate. I had to put a ball valve in my return line to slow the input of my Iwaki 40rlxt and it's only rated at 1100gph. Do I just add more overflows to the back of the tank and drain them into the waste chamber of my sump? won't that make just one heck of a lot of noise.
<Here is a link to an article by Anthony Calfo re this subject.  Should shed some more light for you.  http://www.advancedaquarist.com/issues/sept2003/short.htm>
Thanks
<You're welcome.  James (Salty Dog)>

Flow Question 9/24/06
My question actually is in regards to water turn-over.  I’ve always heard 4 times an hour, which is about where I am now with a 575gph return pump and a 4ft head height.  But I’ve read on your web site, and others, that 10 to 20 times turnover an hour is recommended for mini-reefs.
<That’s correct…you want at least a 10 time turnover>
My sump already sounds like a tidal wave is coming, with water vigorously pouring in from the overflows.  Evaporation is quite fast – 2g a day, because of all the water turbulence, and you can see a constant, steady mist of salt spray over the input area in the sump.  I simply cannot imagine increasing water flow through the sump to 750 to 1500 gallons an hour. I’m sure it would sound like filling a bath tub.  
<Could be a bit scary! I would recheck the plumbing>
I’m running 3 power heads; a 250gph, a 175 and a 110.  They are all causing pretty good flow around the rocks and corals, good water surface turbulence, and turbulence in the water column. Enough to gently blow corals around and keep detritus suspended. I’m hoping this is the case, but does this 10-20 times turnover include power heads and in-tank circulation?   If not, I really can’t imagine 1500 gallons of water going through a sump every hour…
<Scott, the 10 time turnover is a general rule.  You overflow is only designed for so much flow and can only take so much.  I’m not sure of your exact set up, but I would think you could go to at least 750 GPH with no problem.  Flow is very important in a reef tank.  I personally wouldn’t include power heads in your turnover rate…figure those as an added bonus!>
Thanks guys!
<Our pleasure! Cheers – Dr. J>
Scott S.

Pump selections  9/6/06
Dear Mr. Fenner:
<T Ruby>
I am moving up in the reefing world and got a 75RR tank and will be using my old 20g long as a sump. I am a little confused on what pumps to use. I am hoping you can shed some light for me. I bought the MRC MR1 skimmer and the GenX PCX40 for the skimmer pump. I do not know what type of pump to consider for using as my return pump. My overflow is rated at 600gph and has 1" inlet and 1" drain
<An important consideration... won't be able to handle this actual flow rate... Might consider re-drilling or having another through-put drilled... of larger diameter>
and both are plumbed using 1" spa flex hose to the bulk heads in the bottom of the tank. You have any good suggestions on a return pump?
<Yes... Read here: http://www.wetwebmedia.com/pumpselmar.htm
and the linked files above>
I was told to consider the Pan World pumps. Along with this, I would be in need of a 3rd external pump, I am planning on plumbing a closed loop for this system, I really hate the ugliness of powerheads in the tank. I will be using 1.25" PVC going up to a "T" then 1.25" going left and right off the "T" to 90 degree elbows. Then right at the elbows reduced down to 3/4" PVC running up to the top of the tank to a 90, then another 90 going down into the tank. This will be the same for the left side and right sides of the tank.. What type of pump would be able to push about 800-900gph at that head pressure??
<See the above...>
If I do not do the closed loop, what do you think about the wave2k?
<A worthwhile unit>
would this replace a closed loop system?
<Mmm, could>
I am unsure if the wave2k will put flow through out the whole tank?
<Would help...>
Thanks for you help!
<Do read "around" the linked files... on circulation... Bob Fenner>

Water Movement/Corkscrew Worms - 0/29/06
Good afternoon to all!!
<<Morning now...Hello!>>
I have a question about water movement.  I have a 55 gal FOWLR with approximately 65lbs of live rock, and a 3.5" DSB.  I have two very old and inefficient powerheads in opposite corners.  The return is a dual return in the middle of the tank, attached to the front of the overflow.  The return pump is a Rio 3100.  I am have trouble with waste accumulations in the "dead" areas, and have to vacuum out every two weeks.  Would the addition of two 475 GPH powerheads, in addition to the Rio 3100, be too much flow in the tank?
<<Most any tank will benefit from an increase of water flow if employed correctly so as to not blast tissue from corals/provide a random turbulent flow pattern...so no, not “too much”>>
I am also having problems with BGA,  I have read in WWM that increased flow really helps in control of this nuisance.
<<Correct, this alga favors "calmer" waters>>
On the flip side, I have noticed several new growths, as well as the addition of copepods.  The growths consist of some white patches on several of the LR, typically on the undersides.  I am assuming these are sponges.
<<Mmm, yes...likely syconoid sponges>>
I also have seen many small worms, about 1/4 to 1/2" in length.  These come out after the 10K daylight goes off.  They will get up on a peak on the LR, and launch into the current, spinning in a corkscrew like manner.
<<Interesting>>
They are pretty much all over the tank and in the Wet/Dry underneath the main tank.  They are white in coloration.  Any clue what these are?
<<Have heard/read about similar "sightings" of this worm, what you're witnessing is likely reproductive behavior...I don't know the species but it is harmless if not beneficial>>
I would attach pics, but they are way too small to get a clear shot.
<<No worries>>
Anyway....thanks again for all you do for us amateurs!!!
Regards,
Jeff
<<Happy to help.  EricR>>

Adding Powerheads, Tank Marketing 8/28/06
I have a question regarding our 90 gallon tank at work. Internal
We were told that the tank needs more water flow and added oxygen at the bottom of the tank so we'd need to purchase 2 power heads. <ok>
We currently have a mag drive 9.5 with a protein skimmer and overflow. I guess my question is why do they make and sell these entire set ups that hide all the pumps internally if you end up needing to put additional pumps in their anyways?  We just didn't want any pumps showing in the tank.
<In a word marketing.  They either need to design the system with a bigger pump or sell you extra powerheads, both increase cost, limit buyers.  Plus, these system are often based on fresh water designs with an added protein skimmer, which needs less water movement than salt water.  If you are feeling handy try looking into a closed loop system, adds water movement without internal pumps.>
Thanks for your help!
Nancy
<Anytime>
<Chris>

Is it worth it? Upgrades to a FOWLR/Reef... Skimmer and circ. concerns  8/28/06
Hello again WWM crew!
<Mohammad>
    I'm currently planning to upgrade my new FOWLR into a reef aquarium.
Currently, my circulation and the Protein Skimmer are not suitable for a reef setup.
    My preferred place for a Protein Skimmer is in a sump.
<Mine too>
I currently don't have a sump for my 100 gallon tank. I have very limited space for a sump, around 12.5x14" footprint, and about 22" height. I thought maybe I can use an AquaC Urchin Pro for it's slim profile, but after thorough reading in the net and WWM a small sump won't be easy to make (That is, for a 100 gallon).
   Would it be a better idea to use an AquaC Remora Pro H.O.T. instead?
<If the space limitation is as you say, yes>
Or do you think that making a small sump with the Urchin (I personally don't think that I can even squeeze 5 gallons in there...) is a better idea?
<Mmm, too little "room to spare" IMO>
    My second question concerns the circulation. I came to understand that corals in a reef tank prefer random turbulent flow.
<Most species, communities, yes>
I plan to buy two Tunze Turbelle Streams (6060) to place on opposite directions of the tank. Since Tunze Streams are very powerful, I believe they should only be placed on the top of the tank. Will this cause dead spots to form in the bottom of the tank? Or is it not a problem?
<Not likely on both counts, due to the force and volume of flow>
I appreciate your help. Enjoy.
Mohammad
<And you, Bob Fenner>

Equipment/Pumps...Tunze Stream 6060 Circulation Question - 08/26/2006
Hello,
<Hi>
First, I would like to thank you for your great effort in helping those in need.
<You're welcome>
Well, this time I'm one of them. I have a new 100 gallon FOWLR tank that I'm converting to a reef tank soon, and my question lies in
circulation.
Initially I was planning to upgrade my circulation by adding two Maxi-Jet 1200's to total about 600 gph. But I came to understand that I want more circulation. I'm not a big fan of filling my tank with powerheads, and that is when I started to consider the Tunze Stream 6060.
What I liked about it is the power it packed (around 1600 gph). Will this powerhead be enough as the sole provider of circulation for my 100 gallon tank? And what about dead spots?
<An excellent pump, but you will likely have dead spots. My suggestion would be to go with the Dr. Foster & Smith package that includes three Maxi-Jet 1200's and an Aquarium Systems Wavemaker Timer.  This will give you a random flow rate totaling close to 900 gph, and can be had for about 90 bucks complete.  Along with your return pump, this should give you plenty of circulation and little or no dead spots.  Tunze makes an excellent wavemaker box that closely simulates nature, but this would be out of your budget range by another 400 bucks.>
Also do you know if there is any another brand of powerhead that packs a punch like the Tunze and can be used alone (keep in mind that the 6060 is the maximum of what my budget allows)?
<Not in the power head format.>
I also have another question. I'm adding a sump in the near future. My plan is to use a CPR CS100 overflow box (flow rate 800 gph) and an AquaC Urchin Pro (due to limited space), and I am having trouble in choosing a good return pump. What do you recommend?
<I'd probably go with an Ocean Runner 3500.  Will give you 900gph at the head, and is one of the more efficient pumps with a 65 watt current draw.  Do compare others also.>
Sorry for taking your time.
<That is what we are here for.>
Thank you and keep up the great work.
<You're welcome.  James (Salty Dog)>
Mohammad

- Water Flow 8/22/06 -
Hi WWM crew,
I am a beginner in the aquarium marine world and I have a question regarding circulation in my 55g tank.  I have about 1 more week left in the cycling stage and I am looking forward to adding some cleaners in the tank.  I have been able to enjoy some Mysis shrimp and a small white star (about 2mm) so far.  My set up is below.
55g tank
Aqua C Remora Pro (in one corner)
50lbs of sand
55 lbs of LR
2 Seio M620 pump (facing each other toward the front glass)
PC lighting. 2-65w actinics and 2-65w whites
Things have been good so far and the tank is moving along in regards to cycling.  My nitrites are just about at 0 and Ammonia is at 0.  My question is in regards to the flow.  I was just able to purchase a HOT magnum 250 (I placed it in the other corner) and I am just running the activated carbon.  (I do plan on putting all of this in a sump some day.  I don't have the room for it at the moment)  When I set the canister filter in place and turned it on the added flow to the tank really stirred things up on the bottom and off of the LR.  I know that 10-20 times water flow is the recommended range but I think that I am looking close to 1300-1500 gph. Should I remove one of the M620's?  I have played with the positioning to help minimize the stuff from the LS and LR from floating around but the current in the tank still looks pretty strong.   I'm not sure if what I am looking at is too much or not.  Any help would be appreciated. <I'd actually ditch the Magnum 220 instead. You don't "need" the carbon filtration at this point and you can always drop a bag into the outbound side of your AquaC if need be.>
Thanks
Paul
<Cheers, J -- >

- Water Flow, Follow-up 8/25/06 -
Thank you for the response.  I assume the flow isn't too much? <Well... in relative terms, it's difficult to have too much flow compared to the real thing, but at the same time you don't want to be sloshing water out of the tank.> The store (marine only) I was going to told me I didn't need one and then I went to a second store (pet store that deals heavily in marine) told me I should definitely have one. <Have one what?> I figured it couldn't hurt and I have read lots of stuff on this site about people using activated carbon. <Ahh, ok.> I must say this though, and I'm not sure if this is good or not, but the green algae in my water has cleared up tremendously since last night when I put in the Magnum and the tank looks incredible.   It is so clear now where before it had a heavy green tinge to it. <Well, that is one of the things carbon can deal with, but keep in mind that it is pretty much used up after 72 hours in the tank.>  Is it helpful or hurtful to leave it in since I bought it? <It's your electric bill.> Its probably indifferent if I can put the activated carbon in the Aqua C.  I do plan on putting soft corals in the tank at some point though.  I have been reading on this site for 2 months now  (probably too much at work) and I have read TCMA.  Your crew has put together an excellent website full of information.  I'm so excited just to put snails and crabs in the tank let alone fish.  I can't decide what type of fish to put in.  The only definite are 2 clowns.  I figure a couple of small goby's and bennies will be nice.  I already want to run out and buy a huge tank and start this process again and I don't even have anything in my 55 yet. <Take your time.> Thanks again for all of your hard work.
Paul
<Cheers, J -- >

Flow Rates/Tank Turnover/Plumbing Confusion - 08/10/06
Hi,
<<Howdy>>
I used to have a 72Gallon Bow front tank set up but had to take it down. Now that I am setting it back up after a couple of years I had some questions on turnover rate and setup.
<<OK>>
I did read "Water Flow, how much is enough?" by Anthony Calfo and found it really useful.  Since my tank is empty I have the option now to drill holes, plumb the way I want and get a quieter pump.  I had a GEN-X 40 that will be my backup but it was too loud.  I was shooting between 10-20X turnover.
<<A lot of water to process through your sump...can be done, but usually requires some effort to get things flowing well/quieted down>>
But while searching various web sites and talking to people I was advised that I only need 3-5 times turnover through the sump and I should just add a closed-loop to make up the rest.
<<This would be my recommendation as well.  This flow rate through your sump will be MUCH easier to manage>>
Some say over skimming or reduce bubbles or noise etc.
<<...?>>
Some said it is not required in the sump or fuge.  Is this correct?
<<Is what “correct”?  I'm not sure what you are asking here, but if you mean 20x tank turnover through the sump then no, this is not "required">>
It's been a couple of years so I want to make sure things have not changed.
<<Mmm, the hobby is changing/progressing all the time...but fluid dynamics won't have changed>>
Also I was going to put on a Sea-Swirl for more water movement.  I was not sure if one in the middle of the tank or two on each end would be better.
<<Will depend in part on how big (flow rate) a Sea-Swirl you opt for, but generally speaking, one at each end of the tank would be best for good coverage/flow throughout the tank>>
But they seem to only be on the surface so my thought was one in the middle and have a Tunze Turbelle Stream Pump lower in the tank (ever use these? Are they good?).
<<This configuration too could work...and yes, I am familiar/use Stream pumps in my 375g reef tank...an excellent product in my opinion>>
Based on that I can then drill the back for my overflow in the corner or middle.  I have a lot of options and need some help thinking this through.
<<Glad to proffer my opinions>>
a) One or two sea-swirls?
<<Two>>
b) Placement of overflow?
<<Center...with a minimum 1.5" drain and 1" return>>
c) Sea-Swirl(s), closed-loop, or from sump return?
<<For a high flow rate/water movement...the Sea-Swirls (or Tunzes) or closed-loop>>
d) Where to put the Tunze (opposite of overflow if in corner? or opposite of return from sump if not sea-swirl)?
<<Either option is fine>>
e) Where to put the return from sump if not sea-swirl?  Corner, middle, opposite side of overflow?
<<Wherever it is needed to provide/augment flow based on your other configurations>>
f) Does the closed-loop get water from the overflow?  Or do I drill back as source?
<<The closed-loop pump will need its own "source">>
Or add PVC with holes hanging in the tank. (hope that makes sense)
<<For the closed-loop intake?  Mmm, best to drill a bulkhead>>
g) Pump Velocity T4 at 1275GPH - but with 4ft head and 3 - 7 90's depending on how many returns I have.  This is not a pressure-rated pump but according to the flow rates I would get between 1080 - 900gph depending on the how many 90's I have.  Is this enough?
<<For which application?...it is more than you need for the sump return...likely not enough for a closed-loop>>
Do I need more and should I have this split to two returns?
Thanks,
Jason
<<There’s much to consider my friend, please have a read through our plumbing FAQs, here's a good place to start (http://www.wetwebmedia.com/plumbingmarart.htm) and be sure to follow/read among the links in blue.  Regards, EricR>>

More Water Flow   8/3/06
Hi Anthony:
<Hi John, This is Adam J. Anthony helps out with the WWM FAQs and articles still but is not here on a daily basis. He does however have his own forum at Marine Depot. If you would like his opinion I suggest posting there as he does monitor it several times daily. In the mean time I will give you my take on the situation.>
I don't know if you answer these types of questions (you can answer privately if you would like).
< ^^ See above.>
I have been looking at all of the various wavemakers/flow devices that I can find on the net.  I was wondering if you had a personal preference for one or the other for use on an SPS tank.
<I know from personal conversation that Anthony much prefers the use of a closed-loop manifold system to any waver making, power head devices. I tend to agree.>
I have a 110 g. tank (60"x18") attached to a lagoon refugium/sump of? 200 g. if that makes any difference to your opinion.  On first blush I like the Ocean Motion and the Tunze systems:
<No experience with the OceanMotion…only the Motion in the Ocean….sorry bad pun. Tunze products however, are of great quallity.>
but it's so hard to know since I have not seen them in operation.  
< ^^ See above.>
BTW, just thought I would mention that I have asked you several questions over the last few years and you were always very helpful!!!!
<I will pass the thanks on to him.>
Also, pass along to Bob that he has also been very helpful and I enjoy his (sometimes) cryptic answers!!!  
<They are both great at leading people in the right direction without spoon-feeding folks.> <<Thank you for this Adam... my intent. RMF>>
I think it is very admirable that you guys give away your expertise for the benefit of our magnificent charges.
<I too admire them.>
If only we could get everyone in the hobby to take their charges' lives so seriously.
Anyway, thanks to you and Bob for your care and help!!  Greg
<Hope I have helped, Adam J.>

Re: More Water-flow  - 08/05/06
Hi Adam:
<Hey Greg!>
Thanks again for the response.
<Anytime.>
One more quick one for you...I know that a closed-loop is very tank specific but do you know of any DIY-type plans that
could give me a good idea of what I am going for?
<Sure do! An Article actually written by Anthony posted here on WWM: http://www.wetwebmedia.com/pbh2oret.htm.>
I think I understand "random chaotic" but it never hurts to check out someone else's great implementation.  Thanks, Greg
<No prob! Adam J.>

Water Flow/Marine   7/25/06
Hey Crew,
<Brett>
I have a 40 gallon high (36x12x21 - no sump).  Right now for flow I have 2 Maxijet 900s and an AquaClear 70 (for flow/carbon) along with A Remora HOB skimmer.  I'm trying to decide if I need a bit more flow.  Would I be safe to replace the MaxiJets with Seio 620s and keep the AC70?  I'm worried the Seios would have to much flow for my tank and might cause a sandstorm in a well established DSB.
<Two Seio 620's would give you 1240 gph, a little much for a 40 gallon tank.
A total flow rate of 400-450 will be fine.>
I also heard the Seios flow is adjustable.  If so, how much?
<The direction of flow is adjustable, not the flow rate.>
I also thought about a closed loop system and run it with a mag 9.
Thoughts?
<Would be a waste of time/money.  Tank isn't large enough to benefit from this.>
Thanks again!
<You're welcome.  James (Salty Dog)>
Brett

Increasing Water flow in Marine Aquaria…Options    6/14/06
Hi,
<Who goes there? I mean hi…..>
First, thanks in advance for any assistance that you can offer.
<Mmm…you’re welcome in advanced.>
I have been asked to take over maintenance of a marine aquarium in a doctor's office.
<Ooh the service business!>
There are some problems with the hardware setup that I can deal with.  All of the plumbing is on one side of the aquarium, in the wall.  It not easily accessible and I am working on getting that changed.  
<Yes the ease of maintenance and efficiency is by far the most important thing with “business” or “serviced” tanks in my opinion.>
My biggest concern is the fact that the water circulation is on only one side of the aquarium.
<Time to improve that!>
The algae was been uncontrollable for them.
<Probably nutrient problems here not to mention the water circulation issues….I’m willing to bet those light bulbs are old too?>
I have put additional powerheads in the aquarium which seems to control the algae.
<Effective though in my opinion not pretty, aesthetically, in a doctors office.>
The part of the tank that has little of no water circulation is my biggest concern.  I have placed a power head on that side but I don't think it is enough because nothing grows on that side.  The fish and invertebrates even avoid it.
<Time for a more drastic change like pair of Tunze streams or even better for this application a Closed Loop Manifold System.>
I was wondering if a wave maker would help.
<A wavemaker put on the current powerheads will make the powerheads create more aesthetically pleasing and turbulent flow but will not increase (“help”) with the lack of water flow by any means.>
  I have also been considering more power heads but, it is on display and I would like to keep it appealing.
I would be grateful for any suggestions you could make.
<See the above suggestions.>
Regards,
Fawn Curtis
<Good luck, Adam J.>

Re: Increasing Water Flow in Marine Aquaria  06/14/2006
Hi,
<Hello.>
Thanks for your reply.
<Anytime.>
I will research, Tunze streams and Closed Loop Manifold System since I don't know about them.
<Great.>
Just to clarify, I am not in the aquarium maintenance business.
<Oh 'okay.>
I'm just a patient who suffered near fatal brain injury.
<Sorry to hear that, but glad you are here exchanging emails with me today!>
I have been successful with my own aquariums.
Wet Web Media and the Conscientious Aquarist have been awesome resources.
<Thank for the kind words.>
Thank you very much.
<No problem.>
Best Regards,
<To you as well.>
Fawn Curtis
<Adam Jackson.>

Regulating Pump Flow... Inadequate Factory Overflows - 06/12/06
Hi Crew,
<<John>>
I bought an Eheim 1262 to use as the return from my sump to my 90g (with AGA Megaflow).
<<I love Eheim pumps...wish we could get some of the bigger ones over here>>
It's a great pump, but it seems too powerful for the Megaflow system.
<<Not so "Mega-", eh?>>
Actually, I should say it seems too powerful to run the Megaflow quietly - water rushes though the system and it sounds like a dishwasher.
<<Typical of these undersized (Mega or not) factory overflow systems>>
I've read through the FAQs and this seems like a common problem.
<<VERY common>>
One suggestion that helped was to increase the diameter of the hole at the top of the Megaflow drain tube.  However, my system is still extremely noisy, unless I pinch and restrict the flow coming out of the Eheim.
<<Replacing the Megaflow drain tube with a Durso-style standpipe might allow both an increase in flow AND a reduction in noise...but still no replacement for the simple want/need of a larger throughput>>
So my question is (finally) is it safe to add a ball-valve on the return side of the Eheim, or will this produce too much back pressure and jeopardize plumbing connections?
<<This is quite safe and satisfactory, though I would install a gate-valve as opposed to the ball-valve for better "finesse" of the flow.  Magnetic drive pumps such as the Eheim respond to/endure this type of control/adjustment very well.  But do make sure you install the valve on the "output" side of the pump>>
Would it be better to step down to the Eheim 1260 and let it run unrestricted?
<<Not in my opinion.  The plumbing lines will eventually start to restrict from bio/mineral accumulation...but with a twist of the valve you can step up flow to compensate>>
Thanks,
John H.
<<Quite welcome, EricR>>

Closed-Loop...No Manifold - 06/12/06
Hi Crew -
<<Hello!>>
Need some advice please.
<<I'll see what I can do...>>
After reading the FAQs on circulation I have decided to install a closed-loop system w/o manifold on my 92 gal corner FOWLR.
<<Okay>>
I have a decent amount of circulation with out it - about 12X.  I think that's OK for a FOWLR but just want the extra flow and had extra parts, e.g.- pumps, etc.
<<I see>>
I plan to use a Quiet One 4000 pump and a 3/4-inch Sea Swirl wave maker.  My intake would be the intake tubing from an old canister filter.
<<Mmm, as in a siphon tube?  Is this large enough?  Should be the same diameter is the intake port on the pump>>
Because of space limitations I would like to place the pump in the sump with my return pump.  It will still be a closed-loop since my intake will take water from my display and will return it through my Sea Swirl powered by CL pump.  Plus if the pump leaks it will be in the sump.
<<Agreed>>
Are there any draw backs to this approach, e.g.- increased bubbles?
<<As long as you don't have a loose/leaky joints air bubbles shouldn't be a problem, but starving the pump (too-small input line) may cause issues>>
Will I still get the minimum head loss associated with closed-loops?
<<At least, yes>>
Finally does it really matter if I use Spa Flex, i.e.- Flexible PVC of flexible tubing instead of regular PVC?
<<For the application you describe...should be fine>>
Thanks in advance for any insight.
<<Welcome, EricR>>

One pump or two?   5/15/06
Hi Crew
< Hello Adlai! >
I am trying to plumb my new 120 gallon and wanted some advice before going down this path.  Taking your advice I swore that my next tank would be reef ready - no more dinking saltwater for me via J tubes.
< I cant say I blame you a bit! >
The tank has 2 overflows rated at 600 gph each so I expect 1200 gph approx into my sump. In ADDITION to sending water through the 2 returns which come with tank setup I also plan to draw water from the sump via a SCWD using a ViaAqua 2600 rated at 740 gph. This means I will have 4 returns (2 with the overflows and 2 with the SCWD) using the sump water.
So I figured I needed approx a 1200 gph submersible to make allowances for head loss pressure etc. Since the drains are only rated at 1200 gph that is the maximum amount of water that will be coming in to the sump which is 12X24X14. The 2 returns can be powered by either 1 pump (any recommendations) or 2 separate pumps ( I have an Eheim 1260 and a ViaAqua 2600). In addition, another ViaAqua 2600 which is also in my sump, will be shooting water through a SCWD and 2 separate returns.
In regards to the SCWD return, my thinking is that since the ViaAqua is rated at 740 gph, I expect about 50% of water flow because of the SCWD and the returns i.e. approx 370-400 gph of flow.
< You are correct, the SCWD reduce the gph significantly. You may want to employ a larger pump to enjoy the benefits of the SCWD. 400-500 gph will be almost unnoticeable. Think about running the SCWD on a closed loop, with a pump rated for 1000-1200 gph. This can be done without drilling any more holes in the tank. When plumbing the SCWD, consider installing true union ball valves. This will allow you to shut off the water completely, and service the SCWD without losing too much water. Some people will have a secondary SCWD to switch out, while cleaning the first. >
In regards to the regular returns , the Eheim I currently have is rated at 635 gph will give me about  50% water flow at a 5 foot head approx 320-400 gph. The other ViaAqua 2600 will give me about 350 gph at 5 ft head So when I add all 3 pumps in the sump I will be getting approx the 1200 gph which the returns are rated at.  Are there any flaws to this logic?
< Three pumps in the sump may generate too much heat! >
Am I not considering any potential challenges. Should I just use 1 submersible pump to send water back the 2 tank returns so that I will only have 2 pumps in the sump.
< Think about running one pump for the return, rated at or near 800- 1000 gph. With the build-up of detritus and biological waste over time, the maximum water handling of the overflows will be reduced. It is better to be slightly underpowered in that regard. Also, if contact time is crucial in the effectiveness of the filtration methods employed in the sump, slower is better. Think of it this way... Let's say your job is to steal hubcaps. Would you be more successful on the freeway, or in a parking lot? >
I hope this makes sense.
< Makes sense to me! It is good to see planning and consideration! >
Thanks in advance
< You are very welcome. RichardB >

Set-Up 2/Pumps/Circulation  - 05/05/2006
Hey everyone,
<Hello Marc>
I am looking to get an Iwaki pump to power a closed loop circulation system for my reef tank. I am looking at either the MD70 or MD40 pump for the job.
The tank is 120 gallons and I have set the system up to return to the pump in the cabinet and back up to a manifold with four outlets ¾ inch each (I could plumb more in) approx 5 feet above the pump. My question is that there are two types of pumps that seem to be sold, a pressure pump and a circulation pump. What is the difference and is it as simple as picking the circulation model for this task or should I consider the pressure model for other benefits?
<The circulation pump will be just fine.  The pressure models are used for protein skimmers and pressure filters where the water has to have some pressure behind it to operate these systems properly.>
I am considering dropping some outlets down at the back and forcing water through various low flow areas to get the most complete flow.
In doing this I assume it would generate more friction (increased pipe work) therefore more head and a higher pressure requirement?
<Not enough where you would need a pressure pump.>
Thanks for your time
<You're welcome.  James (Salty Dog)>
Marc

Circulation question   4/30/06
Hi,
Thank you for your excellent resource, I do scan read the FAQ daily and have learned much already, also plan to buy Bob's book.
<Oh boy! Another 28 cents, ching!>
In my  (36 inch long) 40 gallon tank and want to make a random circulation pattern.  I've placed 2 CA 1200 powerheads on opposite ends facing each other on the long direction.  Is this too much current?  
<Mmm, nope>
The fish do come out to feed, but go in and behind rock the rest of the time. I've read putting 4 powerheads in all corners facing towards center is best, but I cannot configure them that way, I have to use suction cups on the flat sides of the tank.  If this is  
too much flow, about what size powerhead do you think I should use?
<... Please read here: http://wetwebmedia.com/circmarart.htm
and the linked files above>
In this tank I have a Sebae anemone,
<Please see WWM re...>
clarki clown, purple firefish, a cleaner shrimp, 2 hermit crabs, 8 Trochus intexus snails, 40 lbs live rock, 40 lbs aragonite.  I'm running a Current-USA Outer Orbit 150  
watt metal halide with 2 90 watt dual actinics, and also a 1/10th horsepower Prime mini chiller set at 80 degrees.  Also running a refugium with live rock/sand/Caulerpa prolifera with an in sump Seaclone skimmer that is working good, return pump is a Japanese Iwaki (thanks for the recommendation on this one)
All water parameters are excellent as well.
Thank you for your time.
Craig
<Bob Fenner>

Nighttime Circulation
Hey guys <<and gals>>, first off your website has been invaluable to me since embarking on this amazing journey that is reef keeping--muchas gracias!
<<Ahh...a collective effort, am happy it has proven useful>>
My question is in regards to circulation at night.  Here are some specs: 120G display, 45G sump, Euro Reef cs6-2+, Ice Cap 660 w/440 VHO watts (2 actinic, 2 white), 125lbs LR, Mag 9.5 main circulation pump, and an Iwaki MD70 pump running my closed-loop through the popularly-dubbed "Calfo manifold."
<<Ha!  Indeed!>>
The closed-loop runs 12 hours while the lights are on, providing around an 18-20x turnover, at night however it's probably only around 4-5x/hour.  The tank has been set up for approximately 6 months and is lightly stocked w/3 small fish, a few inverts, and 2 Euphyllia.
<<Sounds good>>
My ammonia/nitrites are 0, nitrates at 5, pH 8.3, 79 temp., and I run my S.G. at 1.025.
<<Mmm...why the nitrates?...on such a lightly stocked tank?...over feeding/liquid supplements maybe?>>
Within the last month I have been getting some red Cyanobacteria on the substrate (probably a little overfeeding), but do you foresee any problems with such a low turnover at night?
<<The 4x-5x turnover rate is likely not a big problem, but I prefer to move water "full-tilt" all the time on a reef system.  I have nearly 30x turnover rate in my system that runs 24/7>>
Would you recommend upsizing my return pump?
<<Why not just run the closed-loop "all the time"?>>
Any advice would be much appreciated.
<<I see no reason to "reduce" your flow at night, your tank inhabitants will deal just fine, and probably appreciate the added circulation/gas exchange/et al.  But even so, I can't say that it's "causing harm" either.  Were it me, I would run the closed-loop 24/7>>
Thanks again.
Jason
<<Regards, EricR>>

Water Flow/Marine/Reef   4/21/06
Greetings to the crew of WWM.  <And to you.>  This is my first letter to you folks, I have learned a great deal from reading your FAQ's and articles.
<Great!> I do have a question that has been hard for most to answer.  I have a 29 gallon reef tank.  It was my first tank I set up and has been my experimentation tank.  
I have many larger tanks now, but this one is my pride and joy, although not that impressive.  It was a fish only with live rock tank, then upgraded to corals.  I noticed the thing I lacked most in the tank was the water flow I could easily do in my larger tanks (90 is smallest).  I delayed the decision, because of the very large bubble Anemone I've had for 3 years now. I know how well they do when they cuddle with powerheads.  I finally dove in and threw in some powerheads.  I have an Aqua Clear 50, 70, and a Rio 600 in there.  I was going to get twin 50's, but wanted to use a Hydor rotating head and knew some power would be lost.  If my calculations are correct I'm flowing 870gph adding all the power heads and filter and skimmer.  Is that way too much?  One of your articles said you couldn't do too much, but that's almost 30x turnover.  There isn't really a vortex or anything, my fish can swim fairly well and there are NO dead spots.  The anemone has never looked happier and the polyps are opening a little more often.  I'm just afraid of having a long term negative effect.  Am I ok? Should I cut down? Any advice would be awesome.  You guys are an awesome source of info and I look forward to hearing from you.
<Generally, 10 to 15% times tank volume is sufficient.  As long as the fish do not appear to be walking in Chicago you should be OK.  You may also want to get an inexpensive wave maker such as Aquarium Systems manufactures.  This will alternate power to the heads and make the corals and anemone even happier.>
Matt in VA  <James (Salty Dog)>

Tunzes In The Night (Night Mode For Streams)   4/18/06
Hi Mr. Fenner!
<Scott F. in for Bob today!>
A short one today. I have two Tunze Stream 6100 with a Multicontroller in my 90 gal. You sure know about the optional "night mode" gadget on the
controller (flow a bit slower at night for simulating supposedly natural calmer sea at night because of high tide...). In another way one could argue that night is when you need more circulation to avoid CO2 buildup. So I would like your opinion on this. Is it really beneficial in the slightest to use that night-mode?
Thanks!
Have a nice day!
Dominique
<Hi Dominique! I am a big fan and user of Streams, myself. However, I have never utilized the "Night Mode" that the 7095 controller offers. I do like the "moon light", however! I personally have not seen any advantage to the night mode. I agree with your assertion that there is a greater buildup of CO2 at night, anyways. However, my real reason for not using the "Night Mode" is related to the reliability of the pumps. In my experience, unless you are absolutely vigilant about maintenance, regularly shutting down the pumps or throttling them into the Night Mode or Feeding Modes means more of a chance for calcium and gunk (that's a technical term, of course!) that may have built up in the impellor to prevent a re-start to the faster pulse modes. That means you'll have a higher likelihood of hearing that dreaded alarm go off, signaling another vinegar soak! No big deal, really, but annoying nonetheless. Another issue I have with the "Night Mode" is that, unless you are very careful about where you are aiming the Stream, you can end up with a simple laminar flow blasting away (even though it's at a lower speed) at your coral tissue all night. Just a thought. Anyways, end the end it's your call about this mode of operation, but I have never used this mode and have enjoyed great success with these pumps. Hope this helps! Regards, Scott F.>

Aquarium Circulation Project - 03/30/06
Hey Guys,
<<Gals here too...Hello Marc>>
I am relatively new (6 months) to marine aquariums and a relatively old hand with most others (20+ years) but I am stumped with the almost contradictory advice one can get from the LFS or online.
<<Yes, many opinions about, including mine...and I'm sure you realize any "one" is not necessarily the "only" correct answer.>>
I would like some advice on the use of surge devices such as the Tunze system.  Is the high cost worth it?
<<If you have the money to spend...yes...but can be accomplished more simply/cheaply utilizing a manifold system or even common powerheads to achieve random turbulent flow.>>
Also I sat down and tried to work out a way to create a similar control system with my existing pump (Iwaki external pump) and came up with the idea of using a programmable relay (essentially a mini PLC) to control 24 volt solenoids on a PVC manifold.
<<Sounds a bit "fiddly" to me, but the idea of employing a return manifold sounds good.  The solenoids might be fun to play with, but aren't a necessity.>>
This gives me multiple inputs to control the solenoids such as feeding stops and light sensors.  I am keen to set this up as I can have infinite control with the relay but my main concern is that the majority of solenoids use a stainless steel actuator on the diaphragm and a stainless steel spring.
<<Mmm, will become a problem if in contact with the saltwater.>>
Is this going to be an issue for the tank as the stainless will be in contact with the salt water?
<<Indeed yes, I have seen many grades of "stainless steel" corrode when in contact (even just dipped and not rinsed) with saltwater.>>
As the solenoids are cheap I can always replace them on a regular basis but I am still a little concerned on any negative effects on my corals, inverts and fish.
<<I would be too...can't say I think this is a good idea.>>
Cheers
Marc
Sydney Australia
<<Regards, EricR...Columbia, SC>>

Plumbing My Chiller And Canister Filter On One Line? - 03/13/06
Hello WWM Crew,
<<Howdy!>>
I am beginning to set up a 75 gallon cold water marine tank in my living room to house an assortment of invertebrates and fish native to the Puget Sound and surrounding coastal waters.
<<Neat!  I lived in Seattle (Belleview) several decades back and still remember visiting the aquarium with its displays of local marine fauna.  Lots of bright colors if I recall...>>
I am planning on using an Arctica Titanium Chiller 1/4 HP to keep the tank around 45 to 50 degrees.
<<Depending on ambient room temperature, lighting, pumps, etc., are you sure this chiller is big enough for that much pull-down?
I also have a canister filter (Fluval 404) which I plan to use in conjunction with a protein skimmer (a Prizm hang-on unit) to keep things running smoothly with respect to water quality.
<<Mmm...perhaps I can persuade you to take a look at the AquaC Remora hang-on protein skimmer.  A MUCH better choice in my opinion.>>
I would like to plumb my system as simply as possible and would like to avoid having a lot of intakes and outflows.
<<Why?  These can be effectively utilized for providing random turbulent flow in the tank.>>
Currently, I am considering two options for plumbing my system with ½” Sch.40 PVC:
<<Mmm, I would consider 1" as a minimum...can be bushed down at the equipment intakes as necessary.>>
(1) Route a PVC intake over the side of the tank’s back wall,
<<Let me suggest...if at all possible, you will be much better off drilling this tank (through the back) and installing 1" (min.) bulkheads for your overflows.>>
with a pre-filter or screen to keep things from getting sucked into the plumbing, this line would then go to the canister filter (which draws 340 gph), then route the outflow to the chiller (which according to the manufacture requires a minimum flow rate of 480 gph) and back up over the back of the tank.
<<Seems obvious...the chiller will not receive enough flow.  In fact, to get the best efficiency from the chiller you should try to maximize flow through the unit based on the manufacture's specifications.>>
My concern with this design is that the chiller will not receive enough flow by relying solely on the canister filter to provide the flow.
<<Agreed>>
Therefore, I was considering putting an in-line pump between the canister filter and the chiller to boost the flow <<!>> although I am concerned that this could be detrimental to the canister filter in some way (e.g., burn out the pump in the filter).
<<Indeed, I would not do this.>>
FYI – the vertical distance between the top of the tank and the chiller and canister units is about 3 feet.  Would either of these options work with this design?
<<Not in my opinion.>>
(2) Route a PVC intake as above to a T, with one line running to the chiller with an in-line pump and the other line running to the canister filter.
<<You need separate intakes/supplies from the tank for each unit.>>
I could then route the return lines back to another T-valve and then run a single return line back into the tank as above. With this design, I am trying to figure out if the placement of a ball-valve in the line running from the T to the in-line pump on the chiller side would be sufficient to prevent water from being diverted solely to the chiller side given the higher flow required for the chiller.
<<Bad idea all 'round my friend.  These "balancing acts" rarely if ever work out.>>
Once the lines are primed, would I have any problems keeping adequate flows in both lines using the T valves from the single intake and to the single outflow line?
<<Indeed...continuously...if it worked at all.>>
If neither of these options seems like a good one, I could revert back to my original plan and plumb the chiller and canister filter separately with one intake and outflow for each component.
<<Ah yes!  In the end, THIS will be the more simple solution.>>
While I realize that a sump may be the best way to go, I am not sure that I am ready to tackle the plumbing on a sump setup as of yet.
<<Is really very easy...maybe even less complicated than your other "solutions."  Please have a look through our plumbing FAQs here (http://www.wetwebmedia.com/plumbingmarart.htm).  Lots and lots of good info!>>
Thank in advance you for your advice!
Jason
<<Very welcome.  Regards, EricR>>

Equipment/Pumps/Selection - 2/28/2006
Hi,
I have a 72x18x15 tank <A well proportioned tank for fish/corals.> that will house frogspawn, hammers, open brain, along with some Monti cap.  I would like to know if a Mag 36 on a closed loop would provide good flow or this pump to big. <I think 3600gph is a little overkill.  Size so you end up with about 900 gph after figuring head losses.>  The tank has dual overflows (2-1in holes and 2-3/4" holes (plugged as of right now)) and a 60 gallon sump that will house a fuge (Chaeto), skimmer and return pump (Mag 36).  I could also regulate the flow on the return via a Gate Valve. I would also like to get a BTA <Do not recommend this mixed with corals, trouble on the way.> and I know they like flow.  The closed loop will have roughly 5 outlets along the top portion of the tank which the nozzles could be directed to provide flow anywhere.
Thank you for your time and expertise. <You're welcome.  James (Salty Dog)>
Jose

Circulation for a 68 Gallon Soft Coral Reef - 02/22/2006
Hello Crew,
<Hi Greg.>
I am planning on making my 68 gallon (36" x 18" x 24") into a soft coral reef. As of now, I just have the sand and live rock in the tank. As for flow, I only have a Aquaclear 500 filter (which will eventually become a refugium) and a Remora Pro skimmer. I know this is not enough water movement. What powerhead brand/type to recommend to keep soft corals happy?
<It will depend on which you choose to keep of course, but you'll want to aim for a 10x per hour full tank turn. Many different brands to choose, a good BB would be a good place to research others experience on various types.>  
How many powerheads do you recommend?
<Depends on flow rate.>
I'd like a powerhead that won't be too strong for the soft corals and that will stop detritus from piling up.
<All comes down to finesse.>                                 Thanks in advance,
Greg
<Sure. - Josh>

Marine Set Up  2/9/06
Hello and thanks in advance for your input. I've attached two photos of hitchhikers that came on my LR that I can't seem to ID. <Don't see any photos my friend.> I spent the past two days pouring over WWM and still can not seem to find an answer. The first photo, id1, seems to e some kind of living organism like a feather duster. Although the one pictured appears to be dead, there are other small patches of this that are have puny white ridges protruding outward. They are about an 1/8 of an inch across and tightly packed together. Any idea's as to what they / it is? Then in the second photo, id2, is what appears to be some kind of growth over the rock. Im pretty sure it is not alive, it has a porous surface. Not really worried about it but would like to know what it was or is.
Also, am in the planning stages of setting up a 55gal reef tank. I plan on getting either a predrilled tank or having one drilled with two, 1" or 1 3/4" drain lines. Would this possibly be to much drainage? <If you go with the Gen-X, two 1" drains will be plenty.> The sump will be a custom 20gal. For inside the sump am planning on using an Aqua C Urchin pro for skimming,<Good skimmer.> 200watt Ebo heater, and am still confused on what I want as far as filtration. I planned on at least 100lbs of live rock as well as a 3" bed of 0.2-1.2mm aragonite which should take care of bio, <Will you be using live rock?> but I'm not sure what to use for chemical and mechanical. Would a power filter even be useful in this setup? <Will your sump have a drawer for chemical/mechanical media?>
As for a return pump, am leaning towards the Gen-X PCX30 (825gph). Would this be sufficient flow or could I possibly be over loading the drains? <That should give you more than enough flow for the 55.> As far as lighting is concerned, I want to keep polyps, brains, maybe some SPS corals, as well as clams. Would 2 x 65w 12,000k daylight lamps and 2 x 65w actinic for a total of 260w of PC lighting be enough for some/all of these? <Borderline for brains, SPS and definitely not enough for clams.  I suggest going with twin 150 watt HQI's for what you have in mind.>
Sorry for so many questions and I'm sure a lot of this is just preference but any advice that could save me from a head ache down the road would be much appreciated.
Thanks, Joel F. <Do reply with answers to my questions and we can finish this up.  James (Salty Dog)>

Water quality/circulation  - 01/24/06
Hi crew, <Hello Mohamed>
I have read a number of times that the total volume of water should be circulated 10 to 20 times.
Is anything higher than 20 times a problem or what is the maximum? <10-15X is good, anything higher would probably be a little much for corals, etc.>
Will a water exchange of 5 to 10% <weekly?> help reduce nitrates instead of a 25% once a month? <Most definitely.>
Is there a way to calculate a minimum/maximum sump size for a DSB based on
the volume of water and live stock? <I go with manufacturers recommendations on sumps, i.e. a Model 75 is good for up to 75 gallon tanks.  Info on DSB's are easily found on the Wet Web Media.>
Thanks <You're welcome>
Mohamed.

Too much filtering or water movement How much is too much? - 20/1/05
I was wondering what would be considered too much water movement. I have a 75 gallon tank and one Fluval
405. I wanted to put in a second Fluval 405 to make sure the tank stays nice and clean. But then I was
worried about the problem of too much water movement. Right now the fish in the tank don't seem to have any
problems with the one filter. What do you think?
<Depends on the fish (and, more importantly, corals. However, in general, fish can withstand - and sometimes prefer - far higher currents than we provide. Ever swum in the ocean? Or a fast flowing river? If I am right in thinking that a 405 provides a max. flow of around 350gph, then two such filters would be perfectly suited for freshwater.... I would be looking for more flow for most marine tanks. Best regards, John>
Thanks,
Rusty

FOWLR Turnover & Circulation   1/18/06
WWM,
<One of us>
Your site is great – thank you.  I have been reading it almost every other day for about 2 months now. Think I am now ready to ask some (hopefully intelligent) Q’s.  I have a 125g glass tank (18”W x 72”L x 22”H) in the wall - planning a FOWLR.  B4 I start ordering things (want to soon), I have some Q’s.  My goal is to keep $$ down w/o tank looking like crap or killing fish.  Here goes:
Turnover:
Q1) For FOWLR tank:   can I “get away with” about 8X turnover (knowing 10X -20X is “best”)?  I am thinking of going with a 1,200 gph capable overflow box, but I’d be limited to 8X if I go with a less power hungry return pump as below.
<Yes>
Details:  I have 5.5’ from floor to tank top, so I figure about 6’ of head.  I am debating return pumps between OceanRunner 6500 vs. Mag 2400.  OR6500 flow is only 1,050 @ 6’ (8X) but only uses 115 watts (annual cost of $140 for my area).  Mag 2400 pumps a nice 1,700 gph @ 6’ (getting me to 10X max of overflow box after gate valve reduction to the Mag), but the thing uses 265 watts costing me $315/yr !!
<You are wise to consider energy consumption and cost>
  Since there’s only a diff. of 2X turnover (unless I  add a 2nd OF box w/ Mag 2400) , I’d rather not pay an extra $175/yr if I can get away with the OR6500 (but don’t want to threaten fish or have noticeably worse water clarity).  What to do?   Beyond the 2X difference above, would adding a 2nd OF and getting the full 1,700 gph (taking turnover to 14X) be worth the extra $175/year in electricity in terms of fish health and/or noticeable water clarity? (or only if I ever go reef) ?
<I would start with the smaller flow rate pump for now>
Circulation
Beyond turnover, not sure how critical circulation is for FOWLR tanks – seems like a very big deal for reef tanks.   Can I can get away with just the circ. from the OR6500 return or do I need some add’l in-tank circ.?  
<Can be added later...>
If so, I’d probably build a top-of-tank manifold  (unless I can  hide powerheads behind my rock which seems likely tough with a tank only 18” deep). I'd only consider powerheads because 2 smaller powerheads + OR6500 would still be less wattage than the Mag 2400.  If I go with manifold, I understand I would clearly need the Mag2400 or higher.   
<Likely so, yes>
Overflow Q’s:  Not a reef-ready tank so must use OF box.  Read bad things about CPR losing siphon so will use a box w/ J tube(s).
Q1:  I understand that in the event of a power outage, if sump has enuf capacity to hold water draining from OF box & pipes, and provided return lines have anti-siphon holes,