Aquamedic Reef Life Calcium 1.5l. Aquamedic Reef Life Calcium is a great source of dissolved calcium for marine aquaria, and is essential for the growth of hard corals. Aquamedic Reef Life Calcium should be added to the water to adjust and maintain an optimum calcium level in your tank. Please refer to the product guidelines for the amounts to use and the optimum frequency of use. Aquamedic Reef Life Calcium can also be added automatically using the Reefdoser, a dosing-controlled pump. Aquamedic Reef Life Calcium should always be used in conjunction with Aquamedic Reef Life KH Buffer, which will stabilise the carbonate hardness (KH) and pH.