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Yes they can. I`ve heard several people say they had that problem. IME as long as the snail stayed on the glass he was OK but when he fell off he was proned to be attacked.
I have snails and hermits together and have not had a problem, just make sure you keep a sufficient amount of empty shells for the hermit to move into when it gets bigger, should be able to get shells from the LFS.
It might not be such a bad thing to have hermits that can 'clean up' fallen snails, especially when it's in places you can't reach or see yourself to turn them over.