Here's a recent post in the El Natural forum that accused snails unfairly (I think) of bad behavior. I've put my response at the bottom:
"Well, I'm starting to have a snail problem. I've got probably 10 fully grown bladder snails and 1 pond snail. The pond snail has been munching my dwarf sag...
About ten days ago I bought one assassin snail to control the snail infestation in my 10 gallon tank.
I haven't seen it anywhere. I know they burrow but is it alive? I think I have a trumpet snail(?) and I see it burrowing about.