My poor little Katrina was never as active as her crabitat mate, Ivan, so I'm not sure how healthy she was to begin with. She hadn't moved all day when I left for spring break, and my crabsitter did as I asked and didn't bother her...so she was exactly where I left her when I returned. I'll be reading the "introducing new crabs" thread, as I can't leave Ivan in there all alone. I chose Katrina because she was moving around at the store, but she quit being active when I brought her home. Maybe the move was too stressful? Anyway, she was sweet while I had her.