Besides calcium and strontium, some coral and coralline red algae also store magnesium in their skeleton. It is biochemically directly involved in the photosynthesis of algae, i.e. the conversion of carbon dioxide and light into organic compounds. Magnesium is therefore one of the most important minerals of seawater.

Tropic Marin® Bio-Magnesium provides magnesium and carbon dioxide in a biologically optimally usable form, preventing magnesium deficiency in seawater and restoring the natural concentration ratio of the alkaline earth metals. These are basic requirements for a healthy coral reef in the aquarium.