Black Spiny Urchin
It's probably reef safe. No it will not stab everything, just those things that are foolish enough to bug it - like a sloppy aquarist who keeps banging his arm against its spines ;)
It may or may not eat coraline. There are more than one species of black spined urchins. I had one that never touched my coraline.
I say had because it starved in my 65 g tank. :(
I won't be keeping any more urchins until I get a much bigger tank.
Fred.
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