digging

Question
I upgraded to a 20 gallon tank for my one crab and improved his substrate and glimbing gear recently. I also bought a new crab to add to the tank. The new crab has been staying underground but I caught hiim in the middle of the night coming out to play.  Today I foung that my original crab has also buried underground. Is something wrong? I don't think either of them is molting.

Answer
Some crabs dig to destress or just to dig. Either way it's perfectly normal for a crab to do. Never dig up a crab unless it's an emergency,  such as the substrate is really saturated and flooded or the tank and crabs have mites.

For more information on land hermit crabs feel free to visit this website.
www.hermitcrabaddiction.net/forum