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Hi. Just posted my own thread on an extraction I did tonight so thought I would respond to your post since nobody ID's it for you. You have a Gall crab there. Mixed thoughts but general consensus is that you should try remove it safely if you haven't already done so a few months back. They can burrow into hard coral or flesh and irritate corals. I removed one from a brain coral but the brain died shortly. I'm definitely no surgeon. YouTube had quite a few videos on how to extract. Good luck.