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The pond water is super hard, so ph swing is very unlikely. I have not done water quality test this year as everything looks normal. i am using the same water company, and thye claim to keep PH between 7.2 and 7.6.
the big kickers are the 2 beni koi, they are the baby of 1 or 2 of those affected, but they are not affected. The second kicker is the koi with thinning beni recovered somewhat after I switched food.
I will do some water testing tomorrow.
stan
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