My pond was 90 gallons and I only one 10" shubunkin, and two medium sized common gold fish. But to increase bioload I added about 15 one inch feed gold fish. I use the feeder gold fish becasue they are cheap at around 20 cents each. The pond itself was running for a solid two years through winter fish inside iced over. I kept the pump going to keep a hole thawed but would have to add warm water sometimes.
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