What's your calcium level? I read an article a few days ago about magnesium control being complicated due to Mg+Ca precipitation. I'm sure there are people with more knowledge on this but if you dose Ca and it causes extra Mg to form a precipitate then you've effectively lowered your Mg levels.
But unless your Ca is low I'd wait for an expert on this reaction before trying it. I could be leading you down the path :S
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