Seachem Reef Fusion 1Seachem Reef Fusion 1 provides your corals with 100,000 mg L of ionic calcium, as well as biologically appropriate levels of magnesium, strontium, boron, manganese, and molybdenum. This ionic calcium supplement will bond with a variety of particles in your aquarium, helping your corals receive the necessary calcium for healthy growth. Provides 100,000 mg L ionic calcium for coral growth Provides biologically appropriate levels of magnesium, strontium,