Seachem Reef Fusion 1 500mlReef 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.Directions:Dose aquarium every 1-2 days. Shake well before using. Add 1 mL of Reef Fusion 1 per ..