Reef Advantage Calcium is a non-caustic blend of ionic calcium designed to restore and maintain calcium levels in saltwater aquariums at the optimal level found in natural seawater. This supplement not only replenishes calcium but also includes magnesium and strontium in precise ratios, ensuring that these essential elements are maintained simultaneously without depleting magnesium or alkalinity. Reef Advantage Calcium is ideal for reef tank owners who need to support coral growth and ensure a stable environment for their marine life.