Agreed, very rare to be reef safe. I have a couple of hitch hikers that looked like yours. When I reached out on r2r the general opinion was they may be an issue the larger they get. I never had any damage to corals from them. I haven’t see them in a few months, I’m curious if they fell victim to my flame hawk.
thanks guy for your help and feedbacks this week i have found my Ophioderma squamosissima totalmente mutilated , i am going to make a trap to catch this crab