Various elements in the natural ocean make coral and living things grow to form a wonderful underwater world. The concentration of magnesium ion in the coral reef area is about 1280-1300ppm. Maintaining the concentration of magnesium ion in the aquarium is helpful for coral growth and repair to maintain the best health, and participates in the photosynthesis of coral symbiotic algae. Hiker Ocean Premium magnesium supplements can balance various ion ratios in seawater, stabilize KH and calcium ions, and reach the standard of natural seawater. This product is free of phosphoric acid and nitrate. It is recommended to detect the amount of magnesium ion, calcium ion and PH when adding to achieve balance.