I agree, it looks like dictoya. Believe it or not, I have bought a prettier version of dictoya twice for my tank, but my hungry little mini strombus snails ate them before they could get established. If the urchin doesn't do it, you may want to try them. Good luck!
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As many naturalists and environmentalists have suggested, we should set aside our arrogance,
our desire to conquer and control everything, and walk hand in hand with Mother Nature. -Walter Adey
Current Tank Info: 180g Seagrass Sandbar Lagoon, START DATE November 28, 2018
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