Opathy

Thanks for the comments. I’ll think I stick with the strips because I’m tired of chasing those nitrate numbers with the master kit.

I have an API master water testing kit and also an Aquarium Coop test strip kit. I’ve noticed there is quite a disparity in the Nitrate test results. The nitrate readings with the strips are always in the safe zone but with the master kit the results are way higher. I use RO water and add minerals back in with equilibrium. Even changing 50% water twice a week I cannot get the master kit to test below 40 ppm. The Co-op kit is showing fine. I can go 2 weeks using the Co-op kit before a water change. Any ideas?