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This is really not a good way to keep koi. But if this is your only alternative then increase the frequency of your water changes (25%) to at least twice a week. I would also suggest that now that your fish have grown, it is time to reduce the overall number so that you bring the TOTAL biomass back to a level it once existed at when you had no problems. So find a home for three or four of the largest ones. Best of luck, JR
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