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 critical levels of calcium and alkalinity necessary for healthy coral growth, while providing biologically appropriate levels of other trace elements and minerals. Sizes: 500 ml, 1 liter, 2 liters