I can confirm 100% that nitrate comes from tapwater or RO/DI and NOT from Instant Ocean salt mix. I always get identical readings on tapwater or RO/DI premix/post mix per salifert and tetra nitrate test kits.
thriceanangel, check through your tank and setup for areas of fug collection, dirty bioballs, or even a dead snail. You'd be shocked how much a tiny snail can screw your nitrates.
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220 & 200 graveyard: Golden Puffer, Purple Tang, Dogface Puffer, Juv. Emp. Angel, Miniatus, Longhorn Cowfish, Juv French Angel. Spec-Only Angler tank.
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