Ampullaria is not a valid Genus name according to Fred Thompson in his book,
Freshwater Snails of Florida. The apple snails commonly sold in stores are
usually the South American Pomacea bridgesi and P. caniculata and not both
are now found in the wild in parts of South Florida. I would not suggest
putting any non-native species into these ponds (this is the way the P.
bridgesi and P. caniculata got into the waters of south florida). In addition
I'm not sure they would make it due to the cold since these are tropical
snails.