The Reef Fusion Two Part System from Seachem is a comprehensive solution designed to maintain calcium and alkalinity levels in reef aquariums. This system consists of two parts: Reef Fusion 1™, which provides essential calcium along with biologically appropriate magnesium, strontium, boron, iron, manganese, and molybdenum; and Reef Fusion 2™, which supplies a mixture of carbonates and bicarbonates to restore and maintain alkalinity. Together, these supplements ensure that calcareous species in your reef tank have the necessary elements for healthy growth. It is recommended to dose every 1-2 days, adding 1 mL of each part per 25 liters of water.