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I am sure the longer the pond, the better. I've read that 8-10 times the desired length is the desired minimum length. (i.e., if your goal is 36" koi, then a length of 24'-30' is the desired minimum length for the koi to have exercise room.) I've never heard of a maximum desirable length.
I have noticed that my koi tend to swim more when the aeration is off. However, I seldom turn it off. So, I think of the extra swimming as a nervous reaction to the change in their normal environment.
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