I had 2 tiny snails sneak into my tank with an Invert order from LA that decimated a small colony of Keds Reds almost overnight. The snail's shell looked like a Nautilis. Just google Zoa eating snail and you'll find them.
Edit: Make sure that's all they'll eat if you decide to try them.
Edit: Make sure that's all they'll eat if you decide to try them.