There is a story behind my killing of snails lol when I had my first betta before I really knew better but he got regular water changes and lived a very happy 3 years in my dorm room. Or at least I think he was happy. But my roommate had pond snails in her tank and they kept breeding like crazy so I took some to help her out and in like 2 years all the snails I had were gone and never had babies though that was from the water changes. Still not sure how I killed the poor things though I think Rain my have helped a bit by eating them. He was a crazy fish...may he swim happily in fishy heaven.