Are you using Ro water for your water changes by doing 50 percent on a 15 your nitrates should be down to 50 . Stick with salfert the other kit is not great it always reads higher than it is
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If the nitrate is really elevated, NOPOX or other carbon dosing (viengar, vodka, etc.) is a fine plan and it will take some time for the levels to come down,. 4 days is not enough unless you add a massive dose.
You want the drop to take weeks, not days.
yup gotcha. this is the 1st time im using it. Hopefully by next week it will be under control
ThanksGood luck and Happy Reefing.