Should i keep this crab? - A "teddy bear crab"

[ah, we are setting up a new tank for our sps and we took some of the live rocks from our main tank and put them in the new tank. We turned the light on last night and guess what we found?:

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yes a teddy bear crab, aka gorilla crab. I searched google and started reading up on it. some pages say that they are peaceful, some say that they eat corals and fish. well, we don't have any fish or corals in this tank right now. Supposedly it pulls up polyps/shells/trash and put it on his shell to camoflauge it. But I don't know. It's about 2~3 Inches across

What should we do with it??

here are the references for this crab:
http://www.saltwaterfish.com/m-inverts/Teddy-Bear-Crab.html
http://www.saltcorner.com/section....ata.htm
http://www.thegoldfishbowl.co.uk/article_crabs.html]



Edited By na1paj on 1109348263
 
[I had one of those several years ago in Florida. I didn't notice him doing any damage. Eventaully he went MIA. You could try him and keep an eye on him for a while. If he shows any tendency to cause trouble then take Tealcobra's suggestion about the refugium.]
 
[Brandon posted pictures of a crab just like it a long time ago. He sent me the pictures and I still don't have them on my ID page yet. Need to get that done.]
 
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