Snail larvae can hibernate for *years* on objects that haven't seen tank water in some time. I had them reinhabit a tank once after I put in a piece of driftwood that had been in the garage for about 3 years. Crazy. Clown loaches will take care of them: they think they're tasty. Plus they're so much fun to watch. Get at least 3-4: they like company. And a little cave for them to sleep in.