Thanks for all of the info. Particularly Mike. Definitely looks to be a mithrax species. I have never seen either of them be aggressive to coral, fish, snails ect. They would grab at meaty scraps (particularly the shrimp that I used to lure it out of its hidy hole), but would mainly graze on algae from my observations.
They have lots of algae in the sump to graze on now.
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