I still think it was that darn hermit crab. He's done some extensive damage in the past, I really should have gotten rid of him long ago, but for some reason I didn't.

I actually picked up another crocea on Saturday, before I posted this thread up, because I figured it had been the hermit crab and I had since gotten rid of him. So far nothing has bothered the clam, the flame angel hasn't even touched him, I've been closely watching.