Miguel,
Looks like some sort of xanthid, and those can be bad. As a general rule, any crab that is hairy, and has black tips on their claws is not reef safe.
I had one that was very similar. It hitchiked in on the live rock, and was very small to begin with. By the 6 month mark, it had quadrupled in size and was eating tentacles of my BTA.
I was able to capture it witha DIY trap, and now he resides in the fuge.
HTH
Experience is something you don't get until just after you need it.
If you're not part of the solution, you're part of the precipitate.
The early bird gets the worm, but the second mouse gets the cheese.
-Stephen Wright
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