rabbut
I don't bite, all that often...
If they are an invasive species, deal with them now. Most machanical methods of killing snails (manual removal) will leave eggs, and you will forever be pulling the little so-and-so's out. I'd use a copper based snail killer at double dose while no fish are in there, as most solutions will knock out the filters or fish or both. Copper is fine for the filters but hard on the fish and some plants. I'd use the copper for a week to remove the snails and the young when they hatch, and have most of that copper removed at the water-change, removing the risk to fish. This will get rid of any snails before they become a pest, and their removal becomes an issue. Watch the ammonia, the rotting snail carcuses may caurse an unexpected rise in ammonia, which could easily go off the chart in a heavy infestation. Remove ornamental snails prior to using any copper in a tank.
HTH
Rabbut
HTH
Rabbut