ATI ICP Element Manganese is a high-purity solution designed to replenish manganese in reef aquariums. Manganese plays a vital role in coral coloration, photosynthesis, and enzyme function, especially in SPS corals and zooxanthellae. Low manganese levels can lead to pale coloration and reduced zooxanthellae activity. Manganese is removed by skimmers, carbon, ozone, and zeolite, making regular supplementation beneficial. Specifications: Size: 150 mL Element: Manganese Form: Liquid Concentration: 4 µg/L per mL per 100 L; one bottle contains 60,000 µg of manganese Dosing Instructions: Shake well before use. Add 1 mL per 100 L (26 Gallons) to raise the current value by 4 µg/L. Recommended Manganese Level: 1-3 ppm Store in a cool, dry place. Refrigeration is not required. Discoloration of the liquid may occur.