They're filter feeders. In the 20g, it was fairly "dirty" so they just helped to clean it for me. Same with the fowlr. When I fed my fish, you could see the siphon tubes poke out of the shell & start sucking up bits of food/nutrients from the frzn mysis & such. I'm not sure how great these manila & butter clams are for nitrate removal. I just thought of them more as living filters to catch & remove small particles.
If I had the money/space/time, I would love to set up a special giant clam refugium as a nitrate remover. Hmmmmm.
Anthony
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