Calcium levels should be in the 380-450 ppm
range and alkalinity should be in the 2.5-4.5 meq/litre range. If one number is way outside this range and the other is inside then the levels would be unbalanced. IME
Reef Crystals mixed to a specific gravity of 1.025 has an alk
of about 2.8meq/l and a calcium level of about 410 ppm
. These values will differ from batch to batch and will depend on temperature, specifc gravity and pH. I mix to about 1.025 with a pH of 8.1 and a temp of @80 degrees Fahrenheit.