Check the listing for details. Combo Pack Seachem Reef Fusion 1 & Fusion 2 (16.9 oz) (500 ml) Each. Condition: New. Listed at 19.66 USD. Product DescriptionSeachem 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 growthProvides biologically appropriate levels of magnesium, strontium, boron, iron, manganese & molybdenum2-part Reef Fusion system maintains calcium & alkalinity levelsReef Fusion 1, when used in conjunction with Seachem Reef Fusion 2, creates a powerful system that helps maintain healthy levels of calcium and alkalinity. Seachem Reef Fusion 2 is specially formulated to supply your tank with the essential carbonates, bicarbonates and alkalinity to help your corals grow. This is the second of the Reef Fusion system that helps maintain proper alkalinity for a healthy live reef environment.Maintains proper alkalinity levels for healthy coral growth2-part Reef Fusion system maintains calcium & alkalinity levelsSupplies tank with needed carbonates, bicarbonates and alkalinityReef Fusion 2 contains a mixture of carbonates and bicarbonates at an alkalinity of 4400 meq/L. It is designed to restore and maintain alkalinity in the reef aquarium and provide calcareous species with the essential carbonate needed for growth.