I have 4 (purples I think) crabs in a 10g tank (the largest I can maintain atm). I just received these guys yesterday, so I had set up the tank with 1inch of play sand as a temporary substrate until I could buy some eco earth. Bought the earth, and came back to find 2 of the smaller guys buried (which is fine right?). Knew I shouldn't go around digging to find them, but accidentally opened the tunnel of one near the water dish. Left him exactly where he was (he was alive but didn't really react) and gently covered him back over with eco earth. His hole is right up against the glass, and I've seen no movement, and I'm pretty sure his hole didn't collapse, but I'm not certain. Was he molting, and if so, did I just screw him up? New to the crab arena, thanks for your help.

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