Best way to lower magnesium?

[littlesilvermax]

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.