This is my 300 gal display tank, it has been running for 2 years now. I changes the aqua scape around the beginning of December
Salinity - 35 ppt
pH - 8.0 to 8.28
Calcium - 420 ppm
Magnesium - 1400 ppm
Alkalinity - 8.0 Dkh
Ammonia - 0 ppm
Nitrite - 0 ppm
Nitrate - 0-2 ppm
Phosphate - 0.002 ppm...