Just to bring up the awareness, there are many things on live rocks that can sting, including stationary snails, bristle worms, and sometimes baby sea urchins. Also some fish can get mad and sting you when you put your hand in a reef tank. Commonly are fish like fox face, hippo tangs. Hippo tangs pack a powerful sting as their first dorsal rays are poisonous. I got zapped once by a blue hippo and the pain was unbearable. Worst of all no pain killer could stop the pain. I was rolling on the floor for two days, then the poison wore out and the pain disappeared suddenly.
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