I bought one from Ocean Aquatics some time back and it grew fast and actually ate some of my nice sps. I don't believe it feeds on sps, but it was feeding on the algae and continue to eat the sps along it's path.
One day I was doing tank maintainence and I dropped a tool into the tank, and I put my hand into the tank trying to catch the tool (it's pure reflex) without thinking about the urchin. Next thing I know I got stung and my finger turns black (I had to dip my hand into warm vinegar to ease the pain) and hand to stop blood circulation from letting the venom from circulating my body. It HURTS! And that was the last time I've seen my fire urchin!
Steven
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