Our Coral Essentials, Coral Power Trace-B is a concentrated blend of Iron, Zinc, Copper, Manganese, Chromium, Cobalt and Nickel. These trace element metals become depleted in marine tanks and need to be replaced. The Iron in our Coral Power Trace-B is at a concentration of 100,000ppm. Use of our Coral Power Trace-B is essential to maintain good growth, and bright colouration of SPS coral. The coral shines and shimmers after regular dosing. Also many other biological processes in marine tanks utilise the trace elements in this blend.