Thank you everyone for your responses. I feel better now. I found a dead fish yesterday morning, at the bottom of the tank with like 5 or more snails on it. I thought "I will get it out tonight", and walked away. I forgot about it until now, and I can't find the fish at all. No meat, no tail, no scales no bones.......This is the first time I have had snails, and I have like 50 of them, and I have to say, they keep a clean shop! My glass is almost completely clear of algae, when less than a month ago it was almost black. ugh. I really love snails right now. I want to put them in my little outdoor tub with my turtle, but he loves them too, as food. I guess it's manual cleaning of his home.