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From what I can see on the photo, fins are eroding away. I personally would get some Tri-Neocide dip and use it. I've always had excellent luck with it when I managed my friend's koi business. If you can't get it locally, I would have it sent overnight.
Just a tip. It usually come in 5 gallon packets, although you might be able to get it in a smaller size. Anyway if you ger the 5 gallon, only mix up 1 gallon in a 1 gallon milk conainer. Then pour enough into a clear fish bag to essentially cover half the koi (back out of the dip so to speak). Move solution back and forth periodically over the koi and infected areas for 3- 5 minutes. Good if you support bag in koi bowl with water...less stressful on fish. Follow dipping instructions otherwise. Release koi (slip out of bag...save as much dip as you can and tie off bag for next day) into the clean water in bowl, then back into pond or tank. Avoid getting the dip into pond or tank. Usually see result in a day or two.
The reason I said mix only partial amount and then use only enough to partially cover the koi in the bag is that you just waste it in my opinion if you follow instructions and mix it all and then use it all at once. Also you'll have extra (in the milk container) if dipping bag get too grungy. Store it out of the light and it's good for quite awhile. You also have extra dry powder to mix in the future (stored properly).
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