SeaChem Reef Plus ™ is a full spectrum reef supplement containing trace elements, vitamins, and amino acids demonstrated to have a positive impact on the growth of corals and other desirable reef creatures. Reef Plus™ is formulated to provide nutrients available from natural tropical reef waters. Contains vitamin B12, vitamin C, thiamine, inositol, choline, iodide, and other essential constituents at pH 8.3. Reef Plus™ is nitrate/phosphate free. It may be used as a food supplement. It complements Reef Complete™ and Reef Calcium™. It is a concentrated product: each 500 mL treats 8,000 L (2,000 gallons).