I've had my 3" Crocea clam for about 4 months or so. It moved a lot at first but finally settled on a spot, attached to a clam hammock and seems to be doing well. My turbo and Trochus snails keep attaching to its shell where they proceed to nap for several hours before moving on. This has been going on as long as I've had the clam. I'm wondering what harm can they do to the clam? And is there anything I can do to keep them off the little guy.