HCA: Hermit Crab Association

Okay so update, I guess Herb is molting and that's why Aduain took his shell because Herb was out of it. Should I still put the new shell next to him? Or just cover him back up and let him finish molting?

I have two PPs in a 20 gallon tank, one of them (Herb) dug down and has stayed there. (I posted about it in the molting section.) Now my hermit crab Aduain dug down into his little cave and stole Herb's shell. Herb is now under the substrate without a shell. I don't know what to do. I know Herb need...

I've recently just got two new hermit crabs and am new to the whole process. Before I got them I researched and read up on taking care of hermit crabs to make sure they would be happy. One of my hermit crabs though, has me a bit confused. I at first had a 10 gallon tank with only a couple inches of ...