Crab id

[I found this crab yesterday when pulling the rocks out of my aquarium. I would like to find out what kind of crab this is to see if it is detremental to my system. I apologize for the pictures being a little fuzzy, but my camera does not take good macro shots. For reference the pvc pipe he is near is a half inch pipe. His nick name for right now is Arnold (he looks like a body-builder). I hope someone can ID him, right now he is staying in what will soon be my refugium. Thanks for any help.]
 
[Could you pull it out, put it in a dish in a well-lighted area and take a few more pictures? I looks like a Gorilla Crab, and those are not reef-safe.

Does it have red eyes?]
 
[one of my infamous rock crabs looked like that. It ate a fish... I had to boil it out of a piece of live rock.]
 
[Actually I just like them for their destructive nature. :devil2: The saving a creature thing is a bonus :D And crabs look wicked cool.]
 
[I still have 7 whelks that need a home. They don't appear to be starving yet. :devil2:]
 
[Here is a picture that I found that I borrowed from Reef Central. The crab in this picture is exactly what I found. This is a picture of the crab in a dish for better viewing.]
 
[I still believe it is a gorilla crab, and thus not trustworthy.]
 
[Well, my general findings lead me to believe that this is a bad character, so Phaux, he is yours if you want him. Just PM me if you want him.]
 
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