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lots of folks have trouble with hermits and snails. Your options are to have snails that are well over or under-sized compared to the hermits so they don't consider them possible future homes. Or to go with all of one or the other, but not both.
I am a new convert, I'm tired of replacing snails there shells can be very decorative so I got rid of all clawed creatures except for a pistol shrimp and 3 cleaner shrimp. I am very happy w/ the results.