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Related FAQs: Hydrozoans 1, Hydrozoans 2, Hydrozoan Identification, Hydrozoan Behavior, Hydrozoan Compatibility, Hydrozoan Systems, Hydrozoan Feeding, Hydrozoan Disease, Hydrozoan Reproduction, Medusoids/Jellies (Ctenophores, some Hydrozoans, Scyphozoans): Jelly Identification, Jelly Behavior, Jelly Compatibility, Jelly Selection, Jelly Systems, Jelly Feeding, Jelly Disease, Jelly Reproduction, Fire Corals,  Lace Corals, Stinging-celled Animals

Some species are startlingly beautiful.