With a FOWLR Nitrates are not a huge concern at or less than 30ppm- But agree with JPreef, you need a large water change, followed with several smaller ones 10-20% over the following days IE 50 percent day on- day 2 or 3 20 percent day 5 20
you will then need to plan your attack baised off of how much they have come down.
Dont panic- I have had high nitrates too- It sucks but with multi water changes over multi days it will come down
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