your two hands??lol umm just a few snails, hermits if you like them. Just dont get to many then theyll be dying in your tank cuz it will be so clean...
I'd get some nails. Astreas are nice and hardy IMO. I wouldn't get any hermits, they'll kill the snails. I don't recommend hermits in a FOWLR. I'd recommed one or two skunk cleaner shrimp, unless you plan on keeping a fish that will eat them.