08-15-2008, 07:49 PM
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Have you only got the the one live plant in the tank? If you're willing to take it out, you could always take it out, remove the larger snails from it, then give it a quick dip in bleach to kill off the smaller snails and the eggs they might have laid on the plant. Then, just rinse the plant in some water with dechlorinator (use more dechlorinator in the water than you normally would). That and the lettuce trick should help.
I had a snail problem myself and debated getting some loaches to solve the problem. Thing is, the only loach that really works in a tank 20 gallons or smaller is the kuhli loach, and they aren't generally very good at eating snails. That's the problem with the really good snail-eating fish - they're either big and/or need big groups to be healthy, or they make awful community residents (like dwarf puffers).