I can't seem to find one of my crabs. I don't know if he's molting or destressing. I've looked everywhere in and out of the tank for him to no avail. There is this sort of small circular opening in the sand at the back of the tat, is that where he is? I did not note any difference in behaviour to indicate he was in pre-molt. Never mind, the little buggar just resurfaced. Whew...never been through a molt and I'm not looking forward to it. But my question still stands...how do you tell the difference between molt/destress? And how do you know where they are when they're molting so you can keep an eye on them, so to speak?