Don't count on it to not reproduce.
Snails are like ants, there's never just one.
I have snails in my aquarium, and I like them there. I have to do population control once in a while, but I like having some.
Some people don't like snails and get rid of them. If you want to get rid of them, I reccomend against using any chemicals. Instead, put a lettuce leaf on a veggie clip before you go to bed at night. In the morning, before you turn your tank lights on, remove the lettuce (the snails should be crawling all over it) and dispose. This will get rid of most of the snails.