If it is indeed calcium deficiency, then you can add coral chips. Stop dosing Magnesium since coral chip contains magnesium and perhaps you should stop dosing K or maintain K at 10ppm. Some others use CaCO3 tablet from pharmacy. Bear in mind that coral chips do have KH buffering capability so if you are using KH buffer, you might want to stop it.
Cheerio,
Sleepy_lancs
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An afternoon trimming my watery garden is better
then an afternoon with a therapist
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