I added my first hermit crab two days ago, and right away it was eating and roaming. From the next morning on though, it stayed in its shell and didnt do anything, until I came home today and it had left its shell and is hanging out, not eating anything on a rock. Does anyone have any idea what's gong on with my little buddy? I mean, I do have friends, but my hermit crab. That'd be pretty sad....