Short of breaking out the chemical weapons, I have done everything to rid myself of pond and ramshorn snails! I tried lettuce and no feeding for 2 days but they didnt like the lettuce. I finally took all decor and plants out and washed them clean. I have sand that I vacuumedm (then my mom vacuumed it much much more aggresively) and I am still crushing them on the glass!!! So I am going to crush any and all I see and drop in an algae wafer (their favorite) and then pull it out when they cover it. Most of the sanils are to small for the assassins to pick up. Hopefully this works. I dont want to pull out sand and everything and start completely fresh...