A Simplified Guide to the Relationship Between Calcium, Alkalinity, Magnesium and pH
When calcium carbonate precipitates, it uses up a fixed ratio of calcium and carbonate (1:1, or about 20 ppm of calcium for each 1 meq/L (2.8 dKH) of alkalinity). This ratio is the same as corals use to deposit their calcium carbonate skeletons. Abiotic precipitation of calcium carbonate, like coral skeletal formation, can incorporate other ions, such as magnesium and strontium. That incorporation will reduce the above ratio from 20 ppm calcium for each 1 meq/L of alkalinity to a slightly lower value. Over the long term this process can deplete magnesium and strontium in an aquarium if only calcium and alkalinity are supplemented.
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So like I said, I'm currently doing 70ml/day of Alk and it's not going up.
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I dose aprox 260ml of ca and alk per day....which means my corals are consuming aprox 18ppm ca and 1 meq/l alk per day.