Combination of nearly all trace elements used and required by corals as far as our experience has shown. Do not use in combination with the ZEOvit system. This product is especially developed for reefers using other systems. Contains strontium, barium, magnesium, iodine, bromium, fluorine, manganese, chromium, copper, nickel, potassium, zinc, lithium, boron, cobalt, rubidium, but no calcium, carbonate, iron. Highly concentrated, do not increase dosing recommendation on the label.