Hello, A while back I got a new larger tank and as each crab from the smaller tank finished molting and came up, I transfered them to the larger tank. It has been way more than 6 months since I have seen the last of the crabs. There are 3-4 crabs left (i cant remember) in the smaller tank (20long) and I still havent seen any come up. One came up about 2 weeks ago and I transfered him over, but from what I can recall he was the very last one to go under about 4 months ago and the others have been under longer. When my mom had 2 crabs in her 10g, one crab never came up and then we smelled a very LIGHT fishy smell. Since the other crab was up, I dug under and found the hermit crab dead in its shell completely burried. Could this be the case with my last crabs? I dont smell anything unusual though besides sand that needs to badly be changed.. I am worried. It has been so long now.