I dunno about "Priest Hat" but it is Tripneustes sp. I had one in my tank. Didn't eat much algae, ate a lot of coralline and got fairly large in my tank. It was approaching the size of a large orange when I finally took it for a trip to the LFS, it was just knocking over too many corals.
Never had any problems with touching it. Didn't know it was toxic.
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Christy's Reef Blog
My 180 Build
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