Ok, I want to get all of the snail knowers advice on this one. I have a blue mystery snail in my 29 gallon tank. Recently I have noticed that he gets nipped at by the barbs. The nip doesn't actually hurt him, but the force pushes him into the glass and little pieces of his shell fly off. The whole front of his shell is just chipped away. Anyone know what I should do to regrow his shell and/or get them to stop pushing him into the glass? Any suggestions would be appreciated.