I used to keep these (I assume you are talking about land hermit crabs?), but but most of them died after a few years. I pretty much agree with what rudegirl said, except I would use sand or a sand-like substrate. Bake or microwave (perhaps) the sand before you use it, though. Actually, the baking may not be as necessary as others might have you believe. They are very fun to watch and study, but beware of the claws. I've had my fair share of pinches from these guys. They are very handleable, but let them come to you for best results.
If you get pinched and he won't let go, submerge the crab and the pinched part of your body in water until he does, or hold hom over running water. They are usually communal, but I had a couple that fought, so be careful. Congrats on the new pet!
Love is patient, love is kind. It does not envy, it does not boast, it is not proud. It is not rude, it is not self-seeking, it is not easily angered, it keeps no record of wrongs. Love does not delight in evil but rejoices with the truth. It always protects, always trusts, always hopes, always perseveres. (1 Corinthians 13:4)
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