HCA: Hermit Crab Association

I have a quick question I have 4 crabs all down for a molt right now. Well tonight I was rearranging the top soil and discovered some legs and a crab I picked him up and he had bright orange legs but wasn't moving I think he may have just molted I gave him a quick he smell and he smelled but NOT dead fish I know that smell from one of my crabs dying before he smelled kind of like mold maybe??? I quickly buried him again and decided to do some research. Anyone have any thoughts on the smell?

Its never recommended to re-bury hermitcrabs as this can lead to them suffocating since they have to create or carve pockets in the substrate which allows them to breathe.I'm not familiar with the smell you described so I can't really be of much help but as this post is late I don't know how things have turned out for you so I can't comment further.