Another thing I though of today regarding magnesium:
I don;t know the chemical reason why, but I have heard before that when you test your water you should wait a day or two for your parameter to settle. Almost like they will not read accurately on a test kit right away. If you are adding something (magnesium, alk, calcium) then you should add some, then test a couple days later and add more.
Perhaps your tank was running higher then your test kits showed, and after a few days they would have showed it. Magnesium will not suddenly increase on its own.
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