something that really drives me a little insane is conflicting information. i tested my alk and salifert says 13.1 freshly calibrated PH 2 month old PH probe says PH is 7.68 some things in the tank look great some look like crap. salinity probe is reading 1.0265, 2 refractometers reading 1.0250.... wahhh... how dafuq am i supposed to keep things stable if nothing confirms? water changes drive alk, PH and redox lower. grrrrr..