I have about 60 fry in a 30 gal tank. I bought a live plant from petsmart, came home washed it good, then put it in the fry tank. As of last count there r 48 snails in the tank, I get 5 or 6 out everyday and flush them down the drain. 2 Questions...... 1. Why is it bad to have snails, the LFS said to put snail be gone in my water to kill the snails. I really don't know what they r harming being in there. 2. Will a chemical like that harm my fry?