COVE KH(Alkalinity) Plus is the same as calcium and magnesium, carbonate is an essential element for the coral growth. If one element is missed, coral will grow slowly, even stop growing. COVE KH Plus improver can provide rational carbonate hardness for reef aquarium to ensure healthy growth of coral and other organisms. COVE KH Plus improver has mild and stable formula, which can set stable and proper KH value and avoid PH value fluctuation on maintain calcium/alkalinity balance, exerting no impact the reef aquarium system.