Salifert Calcium 500ml.
Calcium is a major constituent of calcareous algae, skeletal material of hard corals and the skeletal needles of soft - leather corals. Calcium also fulfills many biological functions. These processes result in depletion of calcium. Quite often a too low calcium concentration retards growth of corals and calcareous algae. NSW (Natural Sea Water) contains 420-450 mg-L calcium. This is also the value we should strive for. For a stable aquarium environment, the fluctuation in calcium content should not be more than approximately 15 mg-L. Coral Calcium is a highly concentrated supplement. In fact a higher concentration is impossible to achieve. Each liter contains approximately 160,000 mg of calcium. Yu will appreciate this when you consider that an average aquarium depletes 5 - 8 mg of calcium per liter, each week