I have 6 clams in my tank - 3 crocea' and 3 squamosas. I don't feed them specifically feed them however I do feed my tanks Phytofeast, cyclopeeze and oyster eggs. I think the most important thing is to make sure they are getting enough light and calcium. If you notice your crocea's mantle starting to fade in colour it is usually a good indication that it is not getting enough light. They are the most light demanding of the clams so moving it further up in your rockwork is probably a good idea. I have my croceas about 15" under 400W MH. HTH
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