ID Black Crab

aaron229

New member
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Hey does anyone know what type of crab is this ?????
It came on one of my rocks i guess and it's growing very fast I think. It was about 1/2 inch when i first saw it and I guess it has been like 3 months. Now it's like 1 1/2 inch big. The feet look a lot like the green emerald, but the body and claws are completely black. Please help ID
 
I don't know what it is but they are common on live rock. It is omnivorous and will eat anything it can catch including many corals and other inverts.

Kevin
 
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