Seachem Reef Advantage Magnesium\nReef Advantage Magnesium is a highly concentrated (80,000 ppm) and optimized blend of magnesium, chloride, and sulfate salts designed to effectively restore depleted magnesium levels in marine aquariums with minimal disruption to the natural ionic balance of seawater.Ideal for reef and marine enthusiasts, this conditioning product supports healthy coral growth and overall tank stability by maintaining magnesium concentrations within the optimal range of 1200\u20131350 mg/L.Usage Instructions:Beginner: Add 5 g (1 level teaspoon) per 80 L (20 gallons*) twice weekly. Dissolve thoroughly in at least 250 mL (1 cup*) of freshwater before dosing.Advanced: Test magnesium levels regularly and follow the beginner dosing regimen until magnesium reaches the target range. Each 5 g dose per 80 L raises magnesium by approximately 5 mg/L. Adjust the amount or frequency as needed, but do not exceed 25 g per 80 L daily. Maintain levels thereafter as required.Expert: A.