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Greetings koiholic. Welcome here and thank-you for posting!
Your K-1 stuff is great stuff. I ran it for a year and learned alot, Mine cycled just like yours. took for ever to get colored then ran great then bingo, the brown is gone and it's light beige in color.
I believe that the bacteria builds up and in the roiling gets to a point where it gets knocked down again. it never did build back up to the color it was in the beginning yet the water parameters held well. My koi kichi who also had k-i and still does, went thru the same thing and thought he needed to increase the air. that really whitened up the k-1. So we lessened the air and it came back to about half what it was with the first round. water parameters offered no change in quality. he has been lately decreasing the load yet it remains the same color.
hope this reassures you that others have experience the same thing. I encourage you to get out a fresh test pack and go thru the basic parameters and check. if nothing shows as a concern then you can relax.
you might want to back off the air abit because many with no help or instruction do roil the water harder than is needed. good luck, get us in the loop and let us know what the testing is showing!
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