Some corals and coralline algae use magnesium, in addition to calcium and strontium, in the formation of skeleton structure. The addition of Tropic Marin Bio-Magnesium to the marine aquarium restores the crucial magnesium/calcium ratio to ist natural saltwater concentrations, ensuring optimal skeletal growth. Tropic Marin Bio-Magnesium contains no phosphates and nitrates.Tropic Marin Bio-Magnesium+ contains a combination of magnesium and carbon dioxide to promote essential biochemical processes in the aquarium+ supplies magnesium for accelerated skeleton growth of corals and calcareous coralline algae+ supplies carbon dioxide for zooxanthellae to promote photosynthesis and calcareous skeleton synthesis+ maintains the natural ionic concentration and the pH value of the reef tank water+ no unnatural by-products+ no phosphates or nitrates+ measured amount of Magnesium in a truly ionically balanced formulaApplication of Tropic Marin Bio-Magnesium:The natural concentration of Magnesium is 1