If I was to place lettuce in the tank how exactly would the snails get to it since they can't swim? Would I have to attach a part of the lettuce to the glass or another surface which the snails use? If so, how do I do that? lol
I've got exactly the same problem with Ramshorn snails. I get them with a turkey baster then squeeze it into a nylon sieve so I don't waste the tank water. I then flush 'em down the loo - I'm worried now in case I cause some sort of plague doing that.
My LFS will be getting some Assassin snails in soon but I've read that they breed like mad too so not sure what to do. Can anyone confirm this please?

mark, if you find a clean jar or some similar open top small container and place the salad leaf (not a fresh salad leaf, a slighty gone off one is best!) in the container with a small stone on it to weigh it down. place the jar/container in your tank and wait untill morning - you should hopefully find the leaf to be full of pest snails and then you can just lift the container with leaf and snails out!If I was to place lettuce in the tank how exactly would the snails get to it since they can't swim? Would I have to attach a part of the lettuce to the glass or another surface which the snails use? If so, how do I do that? lol
it was very very unsightly, I added a small group of Assassin Snails and they wiped them out, when I put them in the tank you could actually see the MTS climbing the glass , it's as if they knew the Assassins were in there.

do apple snails work?
I've heard they do help by eating the eggs of the pest snails but I haven't tried this myself. Since they deposit their own eggs above the waterline, you can remove them if you don't want to raise them.
I will try and get a picture of them ASAP.I've heard they do help by eating the eggs of the pest snails but I haven't tried this myself. Since they deposit their own eggs above the waterline, you can remove them if you don't want to raise them.
The OP hasn't said what type of snail they are, but if they are MTS then they are livebearers so no eggs to eat!
I may get around to placing some lettuce in the tank as suggested, but can it start to decompose quickly?