Anything is possible.. but the starry has only been in the tank for 7 days, and still sticks to his safe cave, far from the clam. He hides when I so much as look at him. (Amazing, how good his vision is.) He may come out when I'm not home. The squamosa shows no damage, and since it's mantle is always full I'd think it would be an easier target. The maxima doesn't have any chunks missing from the flesh, just the discoloration.