Reef Fusion 1™️ Reef Fusion 1™️ provides not only 100,000 mg/L of ionic calcium, but also includes biologically appropriate levels of magnesium, strontium, boron, iron, manganese, and molybdenum. When used as directed, Reef Fusion 1™️ and Reef Fusion 2™️ will maintain the critical levels of calcium and alkalinity necessary for healthy coral growth, while providing biologically appropriate levels of other elements and trace minerals. Sizes: 500 mL, 1 L, 2 L