Calcium is one of the major components in the structure of coral skeletons and shells of many marine animals including giant clams and snails. Magnesium is required to keep high concentrations of calcium available in aquarium water.
Aqua One Calcium and Magnesium is formulated to keep a balance of these two minerals in the marine aquarium.
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Just a quick note to thank you for the great service you have given me and to let you know all the fish arrived safe and alive. I am very happy with them and look forward to dealing with you again in the near future. - Dave P