Well even though my GH is 9 ish, its mostly Ca, 50 ppm and only 4 ppm of Mg. So I add another 5-10 ppm Mg with water changes. Could be the same deal with yours and why the GH booster helped. You likely only need one or the other though.
As for the micros, no idea what to tell you really. All I can say is AR specifically does better with lower micro levels.
By low I mean something like what Vin is dosing (in his Dutch tank with Aquasoil), or down to "Burr Level" which is .015 fe from csmb and .02 Fe dtpa 3x week.
But man all this new stuff coming out regarding edta, it's got me questioning everything that I thought I knew.
So all I can really say is what works pretty good for me and what hasnt.
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