Help identyfiyng mystery crab

The picture looks like an emerald but my rule of thumb is if I don't know what it is take it out especially a crab as they are in general quite predatory.
 
I had one that hid under a platygyra coral that I had for months. Every night before I went to bed I checked to see if the crab was out from under the coral. One night out of the few months I had it he was out. I jumped on it and banished him to the sump. Just keep an eye out. One night he might be in the open for you. You can try searching online for crab/worm traps. The bottle one might work if you know where he likes to hang out.
 
It wouldn't happen to be this would it?
redburrowing.jpg
 
I'm not sure from the pic's, but from what I've read, any crab with hairy anything is a no-no for the reef because of what it eats. I'm not sure how true that is, but I've read that more than once.
 
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