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Looks like an emerald crab after a Molt
how ever before id put my money on the emerald crab theory id like a few more details were was it found? was it a hitch hiker or a purchase? got any pictures looking at it from the front and bottom
hmmm similar incident with live rock. i bought live rock i scanned it and checked it and saw nothing on it aside from a few tube worms. 5 days later i see my emerald crab laying on his back i think he is dead then i notice a much larger brighter green crab on the rock so immediately i think he molted, it wasn't untill i scooped what i thought was a the molted shell out of my tank that i relised it was a whole dead crab and that the other crab was an entirely new crab i had not known about.. any ways back to your crab after checking my marine anatomy book and this other huge book i call the bible of marine fish and invert catalog (basicly a huge book with the names and images of all collect marine hobby species) the winner is RUBY EMERALD crab. Congrats most emeralds are ok with reefs from what im am told but some people mention then nipping at certain corals