Calcium; Magnesium; Strontium and Carbonate are the basic foundation elements of coral skeletons. All of these elements need to be available in balanced proportions for coral health and growth. Foundation Calcium+ contains blended salts of Calcium; Strontium and Barium in the ratio required by corals and is part of Red Sea's complete reef Care program. For best results dose according to a measured uptake of Calcium and in conjunction with Foundation KH/Alkalinity and Magnesium supplements.