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@GoPond2018 given the size of your pond and the fact that it is pretty heavily stocked with koi you would most likely benefit from increased circulation/filtration and aeration. I would shoot for around 2000-2250 gallons per hour total circulation which would be 2x your water volume. Also, you could add a relatively cheap aeration kit which should help. I use the "Aquascape 75000 Pond Air 2 (Double Outlet Aeration Kit)" which is available for around $45-50.