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...