i've got pond snails from store bought plants.
I frantically tried to eradicate them by picking them out madly, i didn't want to dose the tank with anything.
After a short while i realised i was fighting a never ending, un-winable battle when i cleaned my canister filter and found a thriving community of snails in there
Now, i just pick out the bigger ones when i see them (3-5 mm +) to make sure the axies can't eat them and risk impaction (just in case) - the smaller ones they seem to eat and digest fine.
I also suck out the eggs with the turkey baster if i see them.
I still get snails, i'll never get them out faster than they can breed, but im not concerned about impaction now i get the bigger ones out, and they do clean up and eat algae etc, so not all bad.
Bren