How big is your tank?
Snails can be a godsend, or a huge menace. A picture is worth a thousand words!
There are some fish (Clown Loaches come to mind) that love to eat snails, However, they need warmer water and lots of room, and are best kept in groups of 3 or more. I wouldn't recommend it in less than a 40 gallon at the minimum.
Some people "bleach dip" their plants in a weak bleach+water mixture to kill any snails. Personally, I know there is a snail or two alway sin my tank, but they've never become a problem. Sometimes they breed like rabbits and die off when they out-compete eachother.
"In this hobby - Bad things happen over night... The good things take time."
In Progress: 75 Gallon Planted Discus tank
Baby Sitting: 10 Gal Tank with single Convict