Land hermit crabs walk miles and miles each night in search of food on the beach or in the forest. You can fulfill this need by providing a plastic hamster wheel. Mine is the XL wheel because I have large hermit crabs in this tank.
Get the appropriate size for your largest crab.
Coat the entire white metal stand in silicone to prevent cracking and rusting. Re-apply periodically
Mount the wheel on a side wall if you have room.
The white coating will crack and rust over time.
Use the correct silicone! GE Silicone II Clear Caulk in the blue package. Do not buy the mold free version.