Don't know what happened? Woke up this morning and he's lying on his back, I'm thinking he got into it with my 2'' Emerald... , I don't think it's my water quality or my cleaner shrimp would be acting wierd...
Hehe... you don't know how many posts have been made over the years from reefers thinking their crabs or shrimp have unexpectedly died, only to soon discover that they have only molted. I still end up counting the 'living' when I see a molt laying on the sand just in case.