A month or so back I bought myself some dwarf puffer fish for my tank at work. These cute little guys hail from India and are extremely smart. Never cared for them before and admittedly I wasn't sure what was to come from owning them. I bought them anyway due to the shear fact they seemed way too interested in what I was doing. Thought they'd make good cubical mates... they'd give me something to play with.
They ate all of my snails. Micro snails -crunched. Ramhorns - pulled from their shells. Trumpet snails - cleanly snipped out from their spiracle homes. Apple snails - dying of hunger, they ventured out of their shells despite only to find dwarf puffers attacking them with teeth one would only imagine on a hamster. I never saw it coming. And hopefully due to the under developed light sensors snails use for eyes... hopefully they didn't see it coming either.
Let this be a lesson. Don't purchase dwarf puffer fish. No matter what anyone tells you. They may be cute. They may appear to want to be inquisitive. But all they're doing is using their mind tricks to get you to turn off the lights so they can eat every last snail.