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Okay, that seems like a high, but reasonable, rate of consumption. Over time, if you supplement only alkalinity, the calcium level might drop, depending on the water change rate. Calcification consumes about 20 ppm calcium per 2.8 dKH, so it can take a while for the effect to show up. I'd watch the calcium level for a bit, but water changes might be enough to keep your tank in good shape.
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Jonathan Bertoni
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