HCA: Hermit Crab Association

Well, I started with 5 crabs and now there are only 2 that I can find in the crabitat! I think, but don't know that the others have burried? I see no burrows, no signs of death (like smell or bodies) but I do think I've seen 2 shells that use to be inhabited, though I guess they could have changed without me seeing.... I'm so confused. I'm guessing (hoping) that 3 have gone down for a molt but I'm not sure. Guess I will have to wait a few months and see...

they may not even be molting, my crabs used to bury down for a week or so at a time for fun. Same with my new guy now, he digs down for a day or so, pops up for a few minutes to grab food, then digs back down.

Thanks. I am trying not to worry!