silfert

Had 3 Nitrate tests one of them being at the LFS. So confused don't know which to trust! HELP! API Nitrate - 5ppm Salifert Nitrate- 50ppm LFS test strips - 20ppm Phosphates test only with Salifert- 3ppm All other test from ph, salinity, alk all in perfect range. Everything in the tank...