It might have been attacked by the lobo next to it. I'm not sure if lobos hurt each other or not though. I have a lobo almost exactly like the one on the left and it's nasty. Anything within 6 inches down stream is toast. It even took out a patch of aiptasia on my rocks.
I don't suspect the lobo but I have moved it regardless. I agree it looks like a sting but I have never seen had the orange lobo sting other lobos it has been near. Of course that doesn't mean it wasn't the culprit.
I am doing a water change as I type and I will keep you updated.
it certainly looks like a coral attack to me. once the damage is done it can continue to spread. I would consider giving it a dip in coral revive to clean it and then move it away from any other corals and feed it often to give it energy to recover
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