The Red Sea Foundation A B C combo pack is a comprehensive three-part supplement system designed to provide essential building blocks for the health and growth of corals in saltwater reef aquariums. This kit offers calcium, alkalinity, and magnesium in an ionic form that is easily absorbed by marine life, ensuring optimal conditions for coral skeletons and vibrant coloration. Each component—Calcium (A), Alkalinity (B), and Magnesium (C)—is scientifically formulated to maintain a stable marine environment, addressing the specific needs of stony corals (SPS and LPS) and clams.