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This can happen to tangs that have been in your aquarium for years. A pH below 8.0 can induce it. Often all that is needed is a LARGE water change. BTW doesn't spectogram contain both kanamycin and nitrofurazone? Nitrofurazone is packaged by aquatronics as Furacyn. Think of Yellow tangs like a canary in a coalmine. If they don't look right then its time to improve conditions.
Terry B
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