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You are most welcome Richard.
Yes, that's right, this falls into the 'personal problem' category for individual fish problems rather than a group dynamic.
I don't know if I'd try acids? You can use RO water and mix it with your tap water if you like. And as you adjust things you need to watch your pH like a hawk so this is NOT for the general pond setting. This problem is too extensive on the fish you posted a picture of to treat with billion liquid. But if you have others with localized areas, you can try that using a hair dryer to seal it to the skin and heat treat epidermal cells.
I'd aim for nitrate at 5 ppm or lower. You can incease water changes, feed less and add trickle towers in summer. Is fertilizing plants been a problem in terms of nirate readings? You also didn't mention stocking levels or I missed it? How are they?
If you tell me who the breeder is I will tell you if it is likely the source you are getting your fish from taht is making it 'look like' a contagion in your pond? ( you can leave me a PM here at Koi Bito and I'll respond privately so we don't embarrass any one dealer or breeder)
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