Emerald Crab Help!!

keep an eye on him he may be starting a molt or just changing colors i bit i really dont know can you get a pic of him. how is everything else doing in the tank any weird problems.
 
Emerald crabs will do that just before they die too.
I had two that stopped eating, turned white and later died.

Put some algae sheets or something in there for him to eat.
Keep an eye out.
 
As the other have said, it could just be the start of a molt. Emeralds colors will vary based on their origin and their diet. If it is turning white it could be a sign of it not getting the proper food, or not enough of it. Make sure that it has enough algae and it should do ok.
 
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