Several days ago I purchased 10 assassin snails for my 75 gallon which has been overrun with bladder snails. I talked with who I suspect may be the owner(?) and he gave me advice which is helping a lot. Before getting the assassins I had been scooping nearly 150 bladder snails from the glass every day. On his advice I've continued scooping as the assassins do their thing and as of today (three days after putting the assassins in the tank) I'm only getting about 30 bladder snails from the glass. Hopefully within a month between my scooping and the assassins doing their job we can get that bladder snails population down to zero. It's nice looking at my tank and not seeing 100s of bladder snails covering the driftwood, plants, and glass.