No, I wouldn't. Although I have no idea how these two creatures would interact, one of the requirements for keeping snails, I am led to believe, is changing the substrate a couple of times a month. This would prove very stressfull for any tarantula, even if the snail didn't stress it out (which it probably would)
Rats in the hold. Crew is dead, I fear the plague.....
I think you'd either end up with a dead snail or a dead T. Not a good idea.
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Please Click the Dragon eggs/hatchlings!