Red Sea Fish Pharm ARE22007 Reef Foundation Salt Water Conditioners for Aquarium, 1kg Reef foundation ABC+ powder supplement is a foundation element complex for the balanced formation of coral skeletons 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 Reef foundation ABC+ is a blend of all of the foundation elements with the addition of potassium and bromine in the unique ratio required by corals Available in 1-kilogram pack