I've been dosing 2 part for almost 2wks now. All is well. However there's something my Acros are lacking. They are not coloring up at all. I've had them for over a month. I know a little about the importance of magnesium to Acros and would like to start dosing. But I have no test for mag due. Do I dare dose? If so do I dose the same amount as I do the 2part which is 7.5ml?

Parameters are: ca=440~kh=7~ph=8.2 what am I missing