Best solution is to rid your mind of the outdated notion that snails are pests.
There is nothing that snails will ever do to harm your system or any of its inhabitants.
I completely agree. They get a bad rep because they get associated with the nasty, terrestrial garden snails. Unless the snails are covering the glass or decor to the point of being a visual nuisance, there is no reason to get rid of them.
Going back to the question, if your tank can support it you can get some loaches or other fish that will terminate them with extreme prejudice.