We inherited a Regal tang with hole in the head. There's nothing along her lateral line though. I would call it pretty bad because there are rather large black splotches on both sides of her face. She was kept on brine shrimp in a tank filled with green hair algae so I'm pretty sure the poor diet along with nitrates (?) was the culprit. We've been feeding her mysis enriched with Vit C, Kent Zoe and garlic and try to give her nori every other day. Also some vitamin enriched pellets with spirulina. We've had her for a year and she hasn't gotten worse and she's fattening up. So I think she's in as good a shape as she's gonna get. From what I've read you can't reverse it, but as long as it's not getting any worse and they're eating well they're gonna be fine. Good luck!
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Nora
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