The Blue Treasure sea salt for coral reefs aquarium contains all trace elements founded in natural coral reefs seawater, such as calcium(Ca), magnesium(Mg), iodine(I), strontium(Sr), molybdenum(Mo), iron(Fe), rubidium(Rb), manganese(Mn), barium(Ba), selenium(Se),  fluoride(F), bromine(Br), lithium(Li), zinc(Zn), aluminum(Al), nickel(Ni), cesium(Cs), cobalt(Co), boron(B), Vanadium(V) and water-soluble B1, B12,etc..