Red Sea Reef Foundation ABC Supplements (3 × 250 mL Pack) – A complete trio of reef aquarium supplements containing the three essential foundation elements: calcium (A), alkalinity buffer (B), and magnesium (C). Each 250 mL bottle is formulated to raise and stabilize that specific parameter, supporting robust coral skeleton growth and overall reef stability. Used as part of Red Sea’s Reef Care program, these additives help maintain ideal levels of Ca, KH, and Mg in balanced ratios. The set simplifies dosing by providing all three components together, and each solution is of laboratory purity, dissolving easily and mixing clear. By dosing Reef Foundation A, B & C according to your tank’s needs, you ensure corals have the necessary building blocks for strong growth and vibrant health.