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Snails aren't that good at cleaning up leftover food, I have three and they just prefer to have fun rather than do what their supposed to lol plus snails have a very high bioload which would probably just cause more work for you.
Maybe you could try an oto or two in the tank, these are really good little algae eaters and won't touch your fry
It is a furan antibiotic. I don't know how traces of it might affect snails, but Jungle's site specifically states "not recommended for use with crustaceans", which makes it suspect for snails.