Calcium is vital for the proper health, growth, and coloration of your fish. API® Marine Calcium is a natural way to increase calcium levels in your reef aquarium, and should be used whenever calcium deficiency is present in your water.
Use API Marine Calcium when water tests show a calcium level below 400ppm mg L in your reef aquarium.
DIRECTIONS FOR USE:
Add 5 ml per 10 gallons of aquarium water.