That's pretty fast. If the bleaching is slow then there is some hope but when it is that fast it is generally hard to cure.
what is your alkalinity? high alkalinity can produce more of these occurences, especially if your nutriment level is low.
Putting cyanoacrylate (crazy glue gel) on the affected area and a bit more sometimes help. You should try that first.
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More fish die from human stupidity than any other disease...
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