crabs on acropora

i have many of the tiny little crabs that are always on acros but i have this brown fuzzy one much bigger than the little ones on the acros he dont seem to be doing any damage he has been in the tank for quite some time and goes from acro to acro have not seen any damage but all i have heard is that this type of crab is bad. anyone have any info on this type of crab? its almost impossible to get a pic he is about .5 inch brown fuzzy w/ blue colored eyes and only goes on my acros.
 
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