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Jason: Keeping nitrate at just 7ppm after a spawning is extremely good !! I've gotten private email from two people who maintain nitrate levels below 10ppm. One I know to have an excellent filtration system & the other described what sounded very high-end. In both cases, frequent/daily discharge of settlement, moderate stocking levels (approx 500- 600 gallons per koi) and multiple water changes weekly were standard procedures. One indicated a belief that reduced stocking levels was the reason for his low nitrate readings.
Until recently, I was at about 275 gal per koi. (Still am if counting 4 little babes being grown for fun.) Guess I need to find some more homes.
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