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I have had one betta that actually picked ramshorn snails out of their shells. I've also had two that completely ignored them. What kind of snails are you looking to get?
I added a nerite snail into my betta's tank and the betta completely ignores it. I used to have mystery snails in with another betta and he would nip them any chance he got. Depends on the betta and type of snail.