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FAQs on Freshwater Aquarium Chemical Filtration:
Carbon et al.
Related Articles:
Know Your
Filter Media, A Concise Guide to Your Options by Neale Monks,
Freshwater Filtration,
Power Filter
Impressions, A review of some
popular mechanical filtration systems by Steven Pro,
Canister Filters By Steven Pro,
Setting up a Freshwater Aquarium, Tips
for Beginners,
Related FAQs: Biological
Filtration, Establishing Cycling, FW
Sponge Filters, FW Canister Filters,
FW Hang-on Filters,
Ultraviolet Sterilizers,
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Chemi Pure Elite 8/6/08
Hello crew:
I was wondering if any of you have experience using Chemi Pure Elite in a
densely planted tank. I noticed it removes phosphate. The question that
comes to mind is, would it remove the phosphorus I intentionally add to
fertilize the tank thus making it counterproductive.
80 gallons
300 watts
GH 8
KH 5
PH 6.8
Thanks for the input! - Tom
<Tom, the Chemi Pure will indeed remove any phosphate in the water column.
However, the phosphorus in your plant fertiliser may not necessarily be
phosphate; it could be some other phosphorous ion. You'll need to check with
the manufacturer of your fertiliser to find out about this. There are
phosphate test kits on the market (e.g., by Aquarium Pharmaceuticals) so you
can always test the water and see if you genuinely have a phosphate excess
and if not, don't worry about using the Chemi Pure. My standard advice to
freshwater aquarists is not to bother with chemical media (like carbon or
Chemi Pure) unless they have a specific problem they are trying to solve.
Such media are not required in most tanks because generous water changes do
a darn sight better job of diluting nitrate, phosphate and organic acids
than any chemical media -- and at a fraction of the cost. If you have fast
growing plants under bright light (at least 2-3 watts per gallon), then
allelopathy will take care of most types of algae, leaving the fishkeeper
with little more than scraping the glass and pulling away any leaves that
have hair algae on them. Cheers, Neale)
Re: Chemi Pure Elite
8/6/08
You do have a good point about the water changes...
<Indeed I do.>
I just like trying something new occasionally; it's part of the fun!
<Quite so. The thing with freshwater tanks (and perhaps all aquaria) is that
doing water changes is the magic bullet. Because a water change with a
freshwater tank costs very little and does so much good, there's no real
advantage to spending money on devices/chemicals that stretch out water
changes by removing chemicals from the water. People are free to use them if
they want, but all too often the side affects outweigh the benefits.
Typically it's carbon mopping up fish medications so that despite treating
for whitespot, your fish still get sick -- done this myself!>
I'll save the Chemi pure for my reef tank. Thanks for the input - Tom
<Okeley dokely. Enjoy both tanks, Neale.>
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Activated carbon & liquid fertilizer
7/19/08
Hi, just want to know if I add a liquid fertilizer to my freshwater
aquarium with an activated carbon in my canister filter, will the fertilizer
still be effective? Or should I remove the carbon? Thanks
<Activated carbon only removes organic molecules (with a few exceptions like
iodine). Since plant fertiliser contains inorganic forms of nitrate,
phosphate, iron, etc. you should be fine. So go ahead and use them both!
Though as I've commented elsewhere on WWM, the use of carbon in freshwater
aquaria is generally redundant and arguably a waste of money and filter
space. Cheers, Neale.>
Question- Carbon Stunting Fish
06/15/08
A discus breeder I know, who appears quite knowledgeable, told me that
activated carbon in filters stunts the growth of fish. Is there any truth to
this?
< I have never seen any scientific documentation validating this claim. If this
breeder set up six tanks of baby discus with activated carbon in their filters
and then set up an additional six tanks of baby discus without activated carbon,
then raised them together with all the other factors being the same, then we can
compare both the tanks to see if the carbon made a difference. Carbon removes
organics from the water. A good example would be tannins from driftwood. What
does affect fish grow is nitrogenous wastes. If the filter is not cleaned then
the organics in the filter begin to decompose and these waste products inhibit
the grow of fish. This is why water changes are so heavily stressed in raising
baby fish.-Chuck>
Fluval Filter Media, Water
Polishing, Carbon/Chemi-Pure 4/13/08
Hello WWM gang,
Thank you for your great site, wishing you a happy spring.
We have a 125 gallon community tank with 40-45 fish (Corys, swords, mollies,
platys). We operate a Fluval 405 and a Fluval 305 and a UG. We change water 2x
weekly (25% each time, with a UG vacuum and Fluval clean). Our water is clear,
parameters are fine (we do have to watch nitrates). Questions specific to
'filter wool' in the Fluvals and question on use of carbon vs. 'Chemi-Pure'
product.
<Neither critical to freshwater fishkeeping, so use whichever you want. I
personally consider both a waste of time/money compared with good quality
biological media and generous water changes. Compared to these two things, any
carbon or equivalent product has a tiny, tiny impact on water quality.>
After the Fluval first stage sponges, in our lower basket we always use 'filter
wool' as a fine mechanical filter and change it weekly.
We use charcoal in the next basket up (monthly change) and then two baskets of
bio-max ceramic rings (Fluval 405) and one basket of rings (Fluval 305).
<So far pretty normal.>
Fluval says to place filter wool in the bottom basket, and that makes sense to
filter particles so they do not clog the ceramics.
<Yes; about the only thing that really matters with a canister filter is that
the biological media should never become completely clogged with silt. A bit of
silt won't do any harm, but if you see the water flow visibly dropping to less
than half its normal rate, you have a potential problem with insufficient O2
getting to the bacteria.>
Fluval says to buy their "polishing pads" and place in the upper basket (meaning
after the ceramics if this procedure is followed). Are we doing the same
"polishing" the water thing by using 1" thick inexpensive filter wool in the
bottom basket only?
<Pretty much yes. Provided the biological media (the ceramic noodles or sponges)
stay relatively clear, then you can use whatever you want as the pre-filter. My
filters containing nothing more than generic filter wool for the pre-filter and
either the original sponges or good quality ceramic noodles as the mechanical
and biological media.>
Is the Fluval product (we have not seen it) a finer filter material than the
generic filter wool? Do we accomplish the same thing by folding the wool
into a thicker bundle?
<Better to use a thinner layer you change more often, because too much will
reduce the flow of water. But in any case, experimentation and observation will
provide all the answers you need.>
Does the filter wool need to fill the entire basket, or is one inch in the
bottom of the 3" tall basket OK?
<A thin layer should be fine.>
Do we need to add a Fluval "polishing pad" to the top basket or can we stay with
our method?
<Your method is fine provided [a] the water quality is good (i.e., zero
ammonia/nitrite) and [b] the biological media doesn't clog up too fast.>
Carbon/Chemi-Pure: Your site advice in most FAQs says dump carbon and fill with
ceramics; but also suggests in other FAQs using Chemi-Pure in place of carbon.
<There's a difference of opinion among some of us as to the value of Carbon (and
equivalent products). I'm very much anti-carbon in freshwater tanks. For a
start, it's benefits are trivially small compared with water changes. So it
removes "organics" from the water. Fine. So does a 50% water change each week,
at lower cost, and with the added benefit of removing nitrate too. Carbon stops
the water going yellow. Great. So do water changes. And so on. The big negatives
to carbon are that it is [a] expensive over the long term when used such that it
"works" at all, i.e., 100% changes of carbon on a 2-4 week basis; and [b] it
removes medications from the water. This latter has resulted in the deaths of
goodness knows how many fishes that people treated for Ick or whatever and then
were surprised when their fish kept getting sick.>
First, should we forget carbon and Chemi-Pure altogether and opt for more
ceramics? If the answer is 'maybe', what are the deciding factors?
<I would.>
If answer is more ceramics, please answer this Q anyway: Chemi-Pure specs say it
lasts 4-6 months. Is this true?
<Highly doubtful. All these sorts of estimates of chemical media longevity
depend upon the context. In an under-populated tank receiving massive, regular
water changes then perhaps yes, this sort of estimate can reflect reality. But
in the average tank with lots of fish getting lots of food and relatively modest
water changes, I'd be highly surprised if the chemical media really worked that
well. Chemical media manufacturers rely on the fact that you can't possibly test
their products and pull them up on it. How do you know when the media is "full"?
What test would you use? They could be selling you dried macaroni and it
wouldn't make any difference -- you're getting a product that you can't observe
working, can't measure its efficacy, and can't tell if its doing nothing at all!
No wonder they love to sell the stuff!>
If so, what is this material and how is it different from carbon/charcoal?
<In practical terms, very little. Chemi-Pure contains chemicals that (are said
to) remove a few inorganic pollutants including phosphate. Given that phosphate
isn't a toxic chemical in freshwater tanks receiving regular water changes, this
is more a marketing gimmick than anything else. You should always remember that
this stuff is mostly just charcoal, and costs virtually nothing to make. The
profit margins are terrific, and hence aquarium hardware manufacturers are
obviously keen on selling the stuff. Back in the old days when people avoided
doing water changes, carbon served a useful role removing tannins and organic
acids from the water. Without it, tanks often looked rather yellow. But in this
enlightened age, it's redundant, and nothing carbon does isn't better done with
a 25-50% water change at the weekend.>
Cheers, thanks!
Rosemary
<Cheers, Neale.>
Cichlid... spot/markings...
and FW carbon use – 03/20/08
Hello, Neale
<He's on holiday>
I have 55 US gallon FW tank with 5 fishes in it: 2 parrots (hybrid), 2 Severums
and 1 Sailfin leopard Pleco.
I have two questions about my tank.
1) One of my Severums had been in the tank for about 7-8 months. When I bought
him he was about 2 inches long. After few days I noticed that he has 3 white
spots on his body and occasionally scratches himself. I thought it is ich
<Mmm, no... not w/ just three spots, and not just on the one fish>
and treated the tank with the salt and high temperature for 2 weeks. He stopped
scratching but those spots never go away. Now this fish about 4 inches long,
acting normal, but I can see same white spots that probably even bigger. Do you
have any idea what is that?
<Possibly an embedded worm complaint, maybe a microsporidean... there are a few
possibilities here... None really treatable, nor tremendously debilitating>
It still looks like ich to me, but definitely it is not.
2) I followed your advice on WWM and stopped using carbon in my filter.
After that I noticed that pH of my water drops from 8.0 to 7.6/week between 50%
water changes. I don't think it is overfeeding because my
nitrates change only from 10 to 20ppm. Do you think I should use carbon again?
<I would. Not all our opinions on WWM are identical... but for the
reasons/observations you make, I am a fan of periodic carbon use.>
Thank you for your help,
Mark
<Cheers! Bob Fenner>
Mystery Platy Deaths...
chemical filtrant involvement? 3/15/08
I have a platy problem.
I’ve lost 3 platies in three days. First, here’s my tank setup:
55 Gal Freshwater Community Tank – Been up and running for about 18 months now.
Population (Before Deaths):
5 Bleeding Heart Tetras
3 Orange Platies
4 Yellow Platies
2 Zebra Danios
2 Glowlight Tetras
2 Peppered Cory Cats
2 Otocinclus
No live plants, a few rocks, some driftwood, and some aeration.
Water Parameters (as of a few days ago):
Temp – 74F
pH – 7.4
Ammonia/Nitrites – 0 ppm
Nitrates – 7 ppm
KH – 5 deg
Phosphates – 0.5 ppm
<Water quality and compatibility should be fine...>
A few weeks ago, I started controlling Phosphate levels, in an attempt to rid
brown and black algae.
<Mmmm, how?>
My water supply has high PO4 levels (about 2 ppm), so I started putting
Phos-Zorb in the filter. It brought PO4 levels down to about 0.25 ppm, but since
then has started to rise due to regular water changes (~20% water/week).
<Mmm, you might want to just filter the incoming/change-out water>
A couple days ago, I noticed an orange platy couldn’t swim…he would just sink to
the bottom, but remain vertical. He died later that day.
Last night, I noticed a yellow platy with similar symptoms, but he would swim up
for food. He would also stay at the bottom, and/or hide. His fins were severely
nipped, so I figured he probably got beat up and was just injured.
This morning, I found that yellow play dead.
I also noticed another yellow platy hiding, but did not appear injured…just
hiding. I found him dead later this afternoon.
I’m afraid there might be some sort of parasite or something killing off my
fish. All other fish appear OK.
<Mmmm, what fish/es if any, are new/er to this system... How recent?>
I feed the fish tetra flakes every day, with the occasional day of freeze-dried
bloodworms. All 7 platies listed above were purchased about 8 months ago.
<Oh! They themselves are not likely a/the source then>
Any help would be appreciated.
Thanks, Aaron
<I would remove the Phos-Zorb product, seek other means for algal control...
Perhaps just some floating plant... Please read here re:
http://wetwebmedia.com/FWSubWebIndex/fwalgcontrol.htm
and the linked files above. Bob Fenner>
Opinion on Chemical Media in
Planted Aquarium 2/4/08
Hi -
I wanted to get the expert's opinion on chemical media containing carbon with
ion exchange media (such as Chemi-Pure and BioChemZorb) and the planted tank. My
fear would be scavenging too many trace elements and hurting the growth of my
plants.
I've used Purigen with great success, but have heard various rave reviews of the
Chemi-Pure, and - to a less extent - BioChemZorb.
Thanks in advance for your feedback. Your site is, by far, the definitive online
guide for fishkeeping.
Very truly yours,
Stu
<Greetings. I'm not a big fan of carbon in freshwater tanks. It does nothing
that regular water changes don't do better. Carbon was most valued in the Stone
Age of the hobby, where people deliberately avoiding changing the water. 10% a
month was normal. The idea was "old water" was better than "new water". The big
problem with old water is that organic decay in the tank produces organic acids
that lower pH and turn the water yellow. Carbon adsorbs organic compounds, and
by using carbon in a filter, the aquarist could keep the pH stable and the water
clear. Nowadays we routinely change 25-50% of the water per week, so the
dissolved organic compounds in the aquarium never reach a concentration where
they are sufficient to cause harm. In terms of value, biological and mechanical
filter media deliver more tangible results per cubic centimetre of filter space,
and chemical media for buffering water chemistry can also be useful under
certain circumstances. Finally, the active life of carbon (regardless of how it
is packaged or what brand it is sold under) is literally a matter of days. One
manufacturer of fish medications makes the point that carbon over 5 days old
won't have any impact on their medication because it won't absorb sufficient
quantity of that medication to affect the efficacy of the drug involved. That
pretty much sets it out for you in terms of how often carbon needs to be
replaced if it is to do any good. Carbon doesn't removed many inorganic
substances, iodine is the only one of note, if I recall correctly. So carbon
won't really do anything to the CO2, iron, magnesium, etc. that you need to keep
plants healthy. The minerals at least need to be in their reduced rather than
oxidised state, so won't be in the (oxygen-rich) water anyway but in the
(oxygen-poor) substrate. The carbon obviously doesn't do anything to the
substrate. So bottom line, in my opinion, is buy whichever you want since
they're all a waste of money and don't make any difference in the big picture.
Cheers, Neale.>
Questions on Activated Carbon
Hi WWM crew,
I have questions on carbon issue for fresh water usage. Hope you will
clear my doubt and myth on this. Will it absorb vitamins that is being
added to the water? Is it true that it will also absorb all elements in
the water? Thanks in advance
< Carbon removes lots of things. Vitamins and organics are the main ones but
will also remove chlorine and some lead. I think there is an article on carbon
by Dr. Tim Hovanec. Go to Marineland.com and look under Dr. Tim's library. I
think he has an article on carbon. -Chuck>
Cheers.
Runaway Carbon - 05/17/2006
Hi,
<Hello.>
I have a healthy (good pH, 0 nitrates, 0 nitrates, 0 ammonia) freshwater BiOrb
containing a couple of Platy's and White Cloud Minnows. When I cleaned it
recently, some of the carbon pellets 'escaped' from the filter housing. I had
already cleaned - vacuumed & wiped the sides of the tank, and was in the process
of changing the filter, when the 'escape' happened. I managed to scoop all the
floating bits up with a net, but there are a few bits that have fallen in
amongst the ceramic media on the bottom of the tank. The fish cannot reach them,
and I felt I had disturbed my fish enough, so I decided to leave them
there. Now I am a little worried about whether or not they will affect my fish,
and would value your opinion on the matter.
<Ah, no worries. I would get them out when you can, as they will possibly
interfere with additives to the tank, but no rush. When the fish are chilled out
and you can get a very small, fine mesh net in there, go for it. Until then,
don't stress about it.>
Regards, -Sharon
<Wishing you well, -Sabrina>
pH shock, FW – 03/18/07
Dear Crew,
<<Hello, Kris. Tom here.>>
Does a routine carbon change in my freshwater tank cause a pH shock and if so,
how do I get around this?
<<By “pH shock”, I’m assuming you’re observing a significant rise in pH, Kris.
Changing the carbon in your filter shouldn’t affect your tank’s pH levels. If
this “appears” to be happening, I’d surmise that it’s occurring in conjunction
with water changes, which can definitely affect your pH readings. If your water
is inadequately buffered, pH can drop significantly in a short span of time.
Even with adequate buffering in your source water, you can expect to see a drop
in pH levels after a while. A water change, particularly if it’s a large one,
will send pH levels right back up. Kind of a pH roller coaster ride. You do want
to avoid the temptation to chemically alter your pH in either direction. This
typically creates more problems than it solves. A simple/safe way to maintain pH
stability is by making smaller, more frequent water changes. Kind of takes
“Nature” out of the picture and puts the control back in your hands. Best
regards. Tom>>
Carbon Removal, algicide use... 7/28/06
I put an algae inhibitor tablet in my tank and it said to remove the active
carbon when using tablet. How long am I supposed to remove the carbon filter
for?? I don't want to screw up the process.
<A week or so... algicides can be real trouble... Please read here:
http://www.wetwebmedia.com/maralgcidefaqs.htm
Applies to freshwater as well as marine... though there are inputs for the
other, carbon... posted on WWM. I'd be reading there, testing your water daily,
being ready to change out water... Do read re other means of algae control.
Chemical means are the least favorable. Bob Fenner>
New Tank Questions II 1/1/06
Thank you for the quick response. In the past I ran the tank without CO2
with a similar plant load and lighting, about 2 watts per gallon. With CO2 at
8-10 PPM the tank has much more rapid plant growth, at least double. Its more
work but seeing the plants flourish and bubble oxygen is worth it.
<Agreed>
My goal is to get off of the Chemi-pure. I purchased both Seachem Hypersorb and
Purigen. I plan to try them and see if I can get off the Chemi-pure. I have
used Chemi-pure instead of standard carbon for many years. I would imagine I can
get much better technology by now. I just don't know but I have always used some
form of carbon. A bad childhood experience made think it was a must. I think
back think I always overfeed the tank.
< Think about what it is you want the medium to absorb. Chemi-pure absorbs
almost everything, same as poly-filter.>
Again thank you for your time and your advice. Ultimately I want my new large
tank to be as much joy as my 100 gallon. I also want ease of maintenance and
redundancy in filtration. Perhaps if I go with something that includes a
Fluidized Bed Filter I should also install a UPS to protect against power
outages. Regards, Freddy
< Good luck and have fun with your new tank.-Chuck>
Carbon and Plants 11/30/05
Love the Conscientious Marine Aquarist. Do you think that the addition of activated carbon to a planted fresh water tank, that I routinely add fertilizer to, will remove the fertilizer needed by my plants?
John
<Yes, and will quickly become inactive carbon as it does. Unless you are trying to remove a known chemical contamination I would not add extra carbon. Don>
Rinse That Carbon! - 11/25/05
Hi Again!
<<Howdy>>
Well I have finished my treatment with Cupramine and I am very happy with its
results. Now that I have basically done a 100 percent water change, added
Bio-Spira and carbon, here is my question.
<<shoot>>
Might be somewhat stupid.
<<Only if not asked.>>
I bought a small pre-bagged pouch of activated carbon (from Hagen, it's
AquaClear) and put it in the little Cascade filter but I realized that a lot of
carbon "Crumbs" and dust came into the tank. I siphoned out as much of it as I
could but I can't pin-point every spec. Does this dust have any adverse effect
on the fish?
<<Nothing to worry about mate...next time pre-rinse the carbon under the tap to
rinse away the dust.>>
Thanks so much!
-Jon
<<Regards, EricR>>
The True Utility and Function of Zeolite 11/22/05
Hi,
<<Hello.>>
I was just reading the page on the following link
http://www.wetwebmedia.com/FWSubWebIndex/fwchemfiltrants.htm and would like to take the time to clear a point up about Zeolite.
<<Please do (especially after having read the post in question).>>
Zeolite is not a name given to activated charcoal,
<<Carbon, activated carbon. Charcoal is for the barbeque.>>
but it is a compound mineral that is mined in different countries around the world.
<<Yes, very true.>>
Its main function in aquariums is to remove ammonia or other positively charged ions. It can be recharged by submerging it in salt water and then rinsing the zeolite in pure water, for
this reason it should never be used in a marine aquarium, as any ions that are naturally found in the zeolite will be released into the aquarium.
<<Well, this is more than I knew about this stuff (though I knew it was a mineral, such as dolomite is a mineral, and useful only in freshwater), and we can use all the good knowledge we can get.>>
Regards
Lorette Freese
<<Thank you for this information, Lorette. Am posting this morning. Marina>>
Is high ORP achievable with very green water? 9/30/05
Hi WWM crew!
<Rich>
I am trying to improve water quality and control algae in my 150g
Malawi mbuna setup. To that end I recently started injecting ozone
through a protein skimmer, mindful of your guidelines/precautions in
your ozone and ORP FAQs. In the past few days, however, RedOx
potential appears to have skyrocketed from ~270mV to well past the
safe range. Redox potential as of this morning is ~440mV
<Mmm, I would be careful here... and keep this ORP reading below 350>
but green water remains in my tank. This is the problem.
<?>
I gather from this that 1) it is possible that high RedOx potential
and green water are not mutually exclusive, or 2) my brand-new,
cleaned and calibrated ORP probe is reading a voltage that is higher than
actual.
<Possibly... both can occur>
I would very much appreciate your opinion as to whether I can
continue to inject ozone at low dosage despite my not-so-sure ORP of 440mV until
the algae is defeated.
<Takes time... a few days to weeks...>
Thanks in advance, crew. You do a great service to aquariumhobbyistkind.
Regards,
Rich Choy
San Francisco, CA
<Patience my friend... and do turn down that RedOx dial. Bob Fenner>
Tanganyikan Cichlids, Carbon - II - 09/16/2005
Thanks for the reply.
<You bet. Crewmember Sabrina with you, this time, as so many of our
folks (Bob included) are out at MACNA.>
I checked out Eheim's website, and they recommend running carbon
short-term, to take something specific out of the water.
<This is the best/most common use, yes.>
I've never relied only on biological filtration. If I didn't run carbon
on a regular basis, wouldn't my water not be as clear?
<Mm, only if you have something in the tank that continually discolors
the water (like driftwood). With proper maintenance, you should have no
need for carbon except, as Eheim suggests, to remove something specific
from the water (like discoloration from wood, undesirable chemicals, and
emergencies where toxic substances may have been introduced).>
I have always done 20% weekly water changes.
<This is probably fine. I would suggest to try running without the
carbon for a while; it loses its efficacy after a few to several days,
anyhow, so you really won't be "missing" much, I think. Wishing you
well, -Sabrina>
Carbon Filtration 7/18/05
I need some instructions on how the activated carbon filtration works on a
150-200 gallon aquarium that's built in to the back of the tank.
< Go to Marineland.com and go to Dr Tim's Library. Look at the articles on
filtration and you will see one on carbon that should answer all you
questions.-Chuck>
Phosphate removal results - freshwater tank
Dear Crew,
<Glen>
Here's another voice praising y'all for the invaluable service you provide to us in the hobby. Thank you for not paying attention to twits who don't
want to take the time to read.
<A minor irritation... from an extremely small minority of folks.>
Thought you might be interested to hear my results in removing phosphates from my freshwater tank. We started out with phosphate buffers and fake
plants in our 55 gal community tank. Over a period of several months, we replaced all the fake plants with real ones, and upgraded to 110W of light.
<Ah, good>
The algae growth was pretty amazing at first, and as our desirable plants started growing and we increased their numbers, the algae started to at
least slow down - the black brush algae pretty well disappeared, and was replaced with green and some thread algae.
<Good point>
I saw here and other places that excess phosphates made it more difficult to keep algae under control, and
decided to do something to reduce the phosphates. I got an Aquarium Pharmaceuticals phosphate test kit, and the levels were
off the scale - over 10ppm, but no telling how far over.
<Yeeikes... anything over 1.0 ppm can be trouble>
The test immediately turned a gorgeous midnight blue, and got darker from there.
Went to the LFS, and the guy there asked me if I'd be willing to try a new product they were carrying, and tell him how it did. It was the "Marc Weiss
Phosphate and Silicate Magnet". When I got home, I did my usual due-diligence and looked it up. When I saw that people weren't terribly
impressed with most Marc Weiss products, I figured I was in trouble, but then I noticed that someone felt that the phosphate removal stuff was ok.
At $35 for an eight-ounce jar, I really hoped it was more than ok!
<Me too... this one is an "also ran">
I divided the product into two fine mesh bags, and stuck them in the cartridge of my Magnum 250. When I turned it on, I got a gush of
rust-colored water (the active ingredient is ferric oxide hydroxide)...
<Yes... the ingredient in almost all such products>
..that turned the entire water column an ugly reddish brown. Yuck! The color disappeared after about two hours.
I tracked the phosphate levels over the next while. After nine days, there was finally a detectable difference in color in the test - still a midnight
blue, but not quite opaque. Levels dropped slowly over the next week.
After sixteen days, they hit 2 ppm and stuck there for several days. It was pretty apparent that the product was exhausted. When I removed it from the
Magnum, it had gone from its original deep rust color to an odd copper-blue.
I found some Seachem Phosguard on sale, and bought a two-liter bottle of it for $16 ($18?). After a couple of one-cup batches in the Magnum and another
week, I got the phosphate levels down to around 0.5, which is what I wanted to do.
<Great>
In summary, the Marc Weiss "Phosphate and Silicate Magnet" did a yeoman's job of taking the bulk of the phosphates out of my tank. I'd thought about
using the Phosguard from the start, but the directions on it indicated that it exhausts fairly quickly (which I've seen in using it on my smaller tank,
which is in process now). When starting from a 2 ppm level, the PhosGuard did well at finishing the job, but it did take two batches to get it done.
FWIW.
Again, thank you for what you do. I'll send another donation in the next month or so.
Glen
<Thank you for your keen input and kind, encouraging words. Bob Fenner>
Using ammonia/nitrate removing media during fishless cycle
First of all I must congratulate you for your wonderful site.
I have recently set up my 25 gal freshwater aquarium. I am using a canister
filter, loaded with sponges for mechanical filtration, biofiltration media and
Zeolite.
<Sounds good>
Currently, after 2 days running, I get the following readings: pH=7.3 ,
[NH3]=0.5mg/L, [NO3-]=12.5mg/l, [NO2]=0.05mg/L, KH=6, GH=3
Tap water from my area is hard and alkaline (pH around 8 and GH around 7).
<Tank is cycling...be patient and don't add fish until ammonia, nitrite and
nitrate are at zero>
The aquarium is decorated with lava rocks and driftwood.
<I'd be wary of using lava rocks...it is my understanding these leech chemicals
into the water and are not suitable for ornamental aquarium use...>
Is it the driftwood (and/or Zeolite) that softens the water and gives me a low
pH value?
<Driftwood will lower the pH, shouldn't be the Zeolite, which, to my
understanding, is simply a brand name of activated charcoal>
Is the buffering capacity of my aquarium enough or will I experience sudden pH
changes in the future?
<You will have to monitor this to see - I can't give you a pat answer. How big
is the piece of driftwood and what is the pH of your original tap water? If need
be, you can use something like aragonite sand as a substrate to buffer the
water...>
I am planning to add a pair of firemouths, a pair of blue acaras and a
Bristlenose pleco (A. multispinis). The problem is that the appropriate water
parameters listed on the Internet vary from site to site. What are the optimal
water conditions to keep these fish?
<You will always get different information depending on where you look. I trust
www.fishbase.org to have accurate info, along with others...in general, cichlids
like water somewhere around 6.5-7.5 pH, and the Bristlenose pleco would be fine
in that range as well. In reality, pH stability is more important than exact
matching...>
Now before adding the fish, I am planning to follow the fishless method to cycle
my tank.
<Wonderful! Good for you...>
Is it absolutely necessary to add filter media from established aquariums?
<No, this would simply expedite the process. Not necessary at all.>
Should I remove Zeolite from the filter?
<No, leave it in place>
Once the nitrogen cycle is established, should I use ammonia and nitrate
removing media (such as AmmoChips/NitraZorb) or should I leave only the biomedia
(BioStars) with their bacteria to filter the water? Will the accumulation of
nitrate concentration at the end of the cycling process result in an algae
outbreak? I have also read that it is recommended to keep the tank lit during
the process. Wouldn't this normally aid algae growth? Should I add the pleco
after the nitrite level begins to fall, in order to keep algae under control?
<I am not a fan of using chemicals to remove toxins. Water changes will
accomplish everything you need to do, from keeping algae at bay to completing
the cycle. I have always left my tanks lit during cycling, as the algae will
also play a part in the cycle as well. As long as you aren't running power
compacts or other super-powerful lights, you shouldn't have too much of an algae
problem, but do be aware that most new tanks have various algae blooms during
the first several months they are established. Again, water changes are your
friend in this case!>
Thanks. Spyros
<Thank you, Sypros, for doing your homework and being such a thorough and
thoughtful aquarist! Keep up the good work, Jorie>
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