Thanks, forgot to update this thread! It was most definitely a bristle worm. The glass like shards completely covered one of his eyes, to the point where I could barely make it out. I thought he would lose it.
But..he didn't. They slowly fell out (or he rubbed them out, who knows) and he's 100% back to normal. Took about a week, in case anyone else has this happen. He's even started his nesting again (He grabs ANY coral, shell, rock, whatever- that he can pick up, and has a pile in the back of the tank). I suspect this may be how he came to grab a bristle worm in the first place.
Stupid fish.
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125 gallon 6', 33 gallon sump \ refugium
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