...one of the applesnail species, and one, sadly for Americans that APHIS is banning from interstate transport, so they may become quite scarce (but try your local LFS
anyways), although they are plentiful in Florida. These snails eat just about anything, and will decimate plants and even predate smaller fish.
G. A. Christian Bilou, Herpetologist
Founder/Director, Reptile Rescue Alberta
Past-President, Calgary Aquarium Society