You can't get nitrates from pure salt water nitrates are a result of the the breakdown of ammonia to nitrite to nitrate so even tap water shouldn't have any, if there is some the prefilters and RO alone will grab it even before DI. Grab a new test kit nitrate tests are notoriously sucky for what Shade of pink am I looking at
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Current tank---125 gallon mixed reef 60 gallon sump, Reef octopus nw200 skimmer, Rapid LEDs, Maxspec gyre, Mp10s, Fuge, Biweekly 20% WC, QT everything
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