i found these guys under the mantle of my crocea clam, i've read that they feed on clams.......is it true? if so, how do you eradicate them.....they are really tiny and hard to get to.... any known predators for them? i have 2 croceas but i only found them on the larger 1.......i know if there on 1, only a matter of time before they get to the other 1.