Well, I'm SURE someone here knows more about sponges than I do! However, I do have a lot of sponge in my tank....all different colors like pink, yellow, white and orange. I don't feed them anything at all. They seem to just eat what they can. I have read that they are natural suspension feeders, filtering food from the water. Whatever you put in that is left over or the fish cant grab, the sponges will. I hope this helps! They can be really pretty and quite a cool color introduction to any tank.
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 175 Gallon Tank, 33 Gallon Sump, 2 x AI COLOR SOL, Leather corals, colts corals, several brain corals, misc frogspawn, misc sps corals, purple tang, yellow tang, naso tang, hippo tang, 4 clown fish, 5 clams and many many inverts
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