Sounds like snails I do not see any problem with a few snails in most tanks, in fact I leave a few to mooch about in my main tank. They can get out of hand though and that can be a problem.
I have a long grasping tool that I use to hook out any juvinile snails leaving just a couple of bigguns to go about their business......Oh, what do I do with them? Pop 'em Hey, it's instant