Well it was bound to happen. I've been crushing snails to keep the population down and letting my shrimp and cories feast on the remains (they really love snail). The shrimp apparently have gotten the idea into thier head that the non crushed snails might be just as tasty as a crushed one. Testament to this is the ghost shrimp currently doing his very best to eat a live, whole ramshorn snail. Seems to be having a grand time feasting on snail anytime it sticks it's head out.