snails have taken over my 'ol man's fish tank!!! he didn't put any in there, they just appeared! right now, what they do is slowly climb to the top of the fish tank (up the side or on the plants) and when the fish get fed, the snails jump on it!! and weigh it down to the bottom.. then they eat it!! i personally think its great that a load of snails are working together to destroy the bigger enemy but my 'ol man is a bit liberal and wants to save his fish.. how can we do this??