The most comprehensive blend of minor elements ever produced. Detailed research has shown that many minor elements are rapidly depleted by corals and fish. ReefPure Trace Element Supplement replenishes these elements precisely. ReefPure Trace Element Supplement will not cause undesirable algae growth when used properly. ReefPure Trace Element Supplement contains Boron, Fluorine, Lithium, Rubidium, Barium, Zinc, Iron, Molybdenum, Selenium, Cobalt, Vanadium and Manganese. These elements are supplied in a balanced ratio utilized by corals and fish. As with all ReefPure products, Trace Element Supplement contains no Ammonia, Phosphate, Silicates, preservatives, chelating agents or dyes. Contains 12 different ACS grade products in a proprietary formula and quantity. It is produced entirely from Analytical Reagent Grade (A.C.S.) and Pharmaceutical Grade (U.S.P.) raw materials, the highest quality raw materials in the hobby. Warner Marine Research is the only manufacturer to use these fine quality raw materials. It is also highly concentrated, making it highly cost effective compared to lower quality competing products.