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Hi defdac

The Ca and Mg uptake is so different in every aquarium, depending on plant specie, light and so on, that it requires monitoring and maintaining proper levels. You can find details in the Water hardness, magnesium and calcium article here
From my experience keeping Ca stable I have to dose around 10 - 20 ppm every 2 weeks. Mg uptake differ even more then Ca and needs monitoring.

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