The complete Coral Essentials method is built upon a foundation of Trace A, Trace B, and Trace C. Whether you decide to use the concentrated 50ml/100ml Coral Power bottles or choose the premixed 500ml Carbonate and Calcium + Trace you will be running upon this core foundation.
Coral Essentials Coral Power Trace-A is a blend of strontium (50,000 ppm) and barium. Strontium in natural sea water is in the order of 8-10ppm. Keeping strontium at this level is advisable and not outside the range of 5-15ppm. Anecdotal evidence has shown that strontium at below 5ppm in the marine aquarium is detrimental to coral growth.