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. Reef Plus is nitrate and phosphate free. Replenishment of a number of trace elements is required to maintain an environment ideal for the growth and reproduction of marine life.