For snails I usually stick them in my frag tank for about 30 days or more (sometimes I catch all of the frag tank ones and swap them out with the new ones). I rinse them a few times prior to putting them in the tank. Just in buckets trying to get any possible parasites off.
I added an anemone crab directly to my system but again I rinsed him off in bare containers 3-4 times prior to putting him in. Something with a hard smooth shell is unlikely to carry stuff but still possible. If you can I highly recommend everything wet stays in a fish less system a min of 72 days. To keep everything alive this long you really need another tank though. I got ich from a coral once so hopefully I've already had my bad luck.
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