That urchin looks very much like the one I have. Its an Echinometra viridis, sometimes called a white ring urchin. I've had mine for six months and its been no trouble. Usually its tucked away out of sight in a crevice during the day.
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I retired and got a fixed income but it's broke.
Ed
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50 gallon FOWLR, 10 gallon sump.
130 gallon reef, 20 gallon sump, 10 gallon refugium.
10 gallon quarantine.
60 gallon winter tank for pond fish.
300 gallon pond with waterfall.
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