what test kit did you use? how can you have more calcium and same amount of MG 5 days after? did you add anything during that 5 days? If you are using API test kit then trash it. As for dosing you got to manually add it first then test it every single day to see how much your tank consume. Every tank is different so you got to play around with the amount of dosing and testing a few days or week before you get it right.
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