Neither had we until this morning! We were falling asleep when Vogon commented that Spike, the blue prawn that we buy feeder fish for, was getting ready to eat and noticed the snail latched onto a fish. I'm still amazed at its tenacity -- I got photos over a 15-minute span -- especially since the snails mostly keep the glass clean.

Neither did we and no idea, in that order. When I woke up in the morning and checked the tank, I couldn't tell which snail (we currently have three) had been eating the fish.