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FPF, I will rule out 1, 2, & 4, based on the the fact the damage on the kois are 'localized'. You would have seen more evenly spread damage on the kois if 1, 2 or 4.
To check for chroline damage, please net the koi, check its gills. Chroline damage are more visible on gills.
I will return melafix to the play you bought it. That stuff is pretty useless anyway. I will buy ChromaX, or ammo lock instead. add it to the tank to bing NH3 down to less than 0.25. Your biofilter should cycle with that level of doping.
You can continue to do salt dip, 1lb NaCl per 5 us gallon. But I still think Tricide neo dip will do the trick. (I would have done PP dip, 1gm/us gallon, 3 minute) given the fin rot is getting to the body of the koi, you simply can't wait any longer.
stan
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