Vermitid snails

[Nano]

Hey guys, so a few weeks a go I swapped a kenya tree that had taken over half of my tank for a few small pieces of what I was told was clean LR.. well needless to say, that half of my tank is now being taken over by vermitid snails. What is my best bet for a mass kill off of these things? i'm starting to notice them moving to the other half of my tank, in turn rendering about 80% of my LR infested.. is there an additive for the water that will kill them? or a critter/fish of some sort? I know their not bad per say, but they are sure invasive and unsightly.. I'd like them gone.