What should I do? I have a medium-large sized purple pincher crab that has buried himself all the way at the bottom of the substrate so I can see him from under the tank. I noticed three days ago that he is not in his shell, but he is still moving around. I can't tell how far away from him his shell is, it appears to be close enough, but I can't tell where the opening is, if it is filled with EE or clean. My temp & humidity is perfect, and I am using all EE. I am not sure if I should just leave him be & hope for the best or dig him up so I can clean out his shell for him & maybe offewr him a new one. I am afraid digging him up at this point may do more harm than good because it looks like he just molted, but I am worried that he has left his shell for a reason & afraid he won't return to it if it is fill with debris. I may try to dig up only the shell, clean it, and replace it, but I am afraid I will collapse his air hole in the process & disturb him. It has been three days since I noticed, and he is still moving (Looks like he is almost done eating his old exo). If I could not see his bare abdomen through the glass I would have no other indication that he wasn't perfectly fine. What should I do? Has this ever happened to anyone before?