Sailfert - Coral Calcium
Quite often too low a calcium concentration retards the growth of corals and calcareous algae. Natural seawater contains 420-450 mg/L calcium and this is also the value we should strive for in a stable aquarium where the fluctuation in calcium content should not be more than approximately 15 mg/L.
The addition of Coral Calcium immediately makes 100% calcium available to your corals and other calcium-requiring organisms. If calcium is depleted because of the growth of corals and coralline algae then supplements such as Salifert's KH+pH Buffer and Strontium are also required.
Since, together with calcium, they form the major ingredients of shells, coralline algae and the skeletal material of corals