Seachem Reef Advantage Magnesium is a premium magnesium supplement designed to maintain optimal magnesium levels in marine and reef aquariums. Magnesium is a critical element for coral health, as it supports the growth of corals and coralline algae while stabilizing calcium and carbonate levels. This easy-to-use powder formula dissolves quickly and is free from impurities, making it safe for all marine life. Ideal for reef enthusiasts, it helps create a stable and thriving aquatic environment.