I got some hitchhiker bladder snails on a plant. I have found quite a few in my 29 gallon. I really don't enjoy small snails in my 29 gallon since I hatched mystery snails once and since then I hate having small snails in that tank. I thought about getting an assassin snail but would that harm small fish or Nerite or Mystery snails? I would only get 1 assasin snail. Thanks for reading