Alot of my snails (localy collected) have been going missing. I know my hermits enjoy eating them and have also seen my maroon clown and pair of damsels have the odd bite of them when they wander too close to their territory. This afternoon i noticed this: The spiral shelled snail appeared out of nowhere and proceeded to carry the black one up the glass and eat it!!! It held it for a while by the shell, then started manouvering it to get at the soft parts. The black snail was producing copious amounts of slime which soon attracted two more of the spiral shelled snails. At this point i put an end to things and removed the three offending snails. The balck snail had a visible "bite" mark on its foot, but seemed to scurry off happily once put back in the tank.