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).