Red Legged Hermit Crabs

It will do on its own, so you should have some empty shell laying around for it to choose from, otherwise they are likely to go after your snails for their shells.
 
You'll know when all of a sudden your crab is walking around in one of your snails' shells.
I had my red legged crab for about 5 months before he upgraded his home. I had spare shells in there for him and everything but I guess he just had to have the astrea's shell.
 
Unfortunately sometimes even with empty shells, hermits will go after the snails. I've got about 100 random hermits in my tank, and they've pretty much all went after whatever snails were not up on the glass
 
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