Derasa clam shrinking

[slitwin]

I have had a derasa for about a month now nad he has been a great addition to the tank. Yesterday he started shrinking down into his shell and he's not looking good at all. Does anyone know what I can do to help him out?

Thanks

[kar93]

Have a close look on the shell for little snails.
http://www.reefkeeping.com/issues/2008-02/nftt/index.php

[slitwin]

I did actually see one of my turbo snails attached to him the other night. The snail was attached to the bottom of the clam and I didn't think anything about it. But, that's when the clam started looking bad. Could the snail have done something to him?

[seapug]

Most likely not caused by the turbo, but the turbo might be sucking on muck generated by some sort of damage/infection to the byssus. The snails in the article are obligate parasites. Turbos aren't "clam eaters."