I recently got back from a trip to Aruba, while there I collected some
small shells from the beach - thinking they were empty. When I got
home I put the shells into some water to clean them off - and some of
the shells still had live snails in them!

Could I put these snails into my freshwater aquarium with no trouble -
will the snails survive in freshwater? Will my fish (plattys, rosy
reds, pleco) be fine?