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It is definitely better to do 10% water changes two or three times per week than doing 20% or 30% at a time. I don't because I have only Saturday to do pond maintenance. The key is to avoid fluctuating water conditions. The goal is stability, recognizing that water conditions in a koi pond are continually in a state of degrading. I can do 35% or even 50% water changes without a problem because even on day 7 the parameters are virtually identical to my source water.
Your work schedule limits what you can do to achieve optimal care. In the best of all worlds, the koi would be fed small amounts hourly throughout the day... and even into the night. For most working folks, twice per day is the best that can be done. I would like to try a feeder, particularly a demand feeder. (There is an old thread about demand feeders on this board. The koi really do learn how to trigger the food release and only release as much as they will eat.) However, there are so many raccoons, opposums and squirrels getting into things that I've not bothered to try.
In theory what you've been told about the nitrifying bacteria is accurate. ....but, reality and theory do not always match. Nitrifiers are very adaptive and some ammonia is always present if fish are present. I'd not be overly concerned about the nitrifiers. Optimizing the koi would be my concern, which pretty much gets you to the same place. In 2,000 gallons you really do not want to produce 30" females. You'll be much happier, the fish healthier and the pond more attractive if you focus on males.
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