My tank is being overrun by these snails. They are everywhere. I have 2 clown loaches and an assassin snail and it is just getting worse. They almost have the body type of the assassin so I don't know if it was pregnant or something when I got it. I haven't gotten any new driftwood or anything in a yr. I had pond snails from that but that's why I got the assassin and now this is way worse. Help please! I want to get rid of them.