I just got a new derasa clam. Its about 4 inches long and looking great. The only thing is that it moves a lot. I did a little research and the LFS was no help. So far this forum is the best thing I have found for clam information. So, how do I get it to stay put? I read a little bit about oyster shells? Hows that work? What, exactly should I feed my clam? I read one article that said calms do not feed at all and another that said they absolutely need to be fed to survive.
Help me reef central clam gurus!!!!!!:
Tank= 55 gal, DSB, 440 VHO, LPS, some SPS, softies. The tank is fed Kents phytoplex and selcon regularly. What size food does a clam eat? Do they uptake DOC?

Tank= 55 gal, DSB, 440 VHO, LPS, some SPS, softies. The tank is fed Kents phytoplex and selcon regularly. What size food does a clam eat? Do they uptake DOC?