I do need to interject here:
i used the liquid that came with ph up and down for a year and a half. At that time I started to add Floralicious, molasses, etc. after additives it is my opinion that one cannot get an accurate color read...because the nutrients are not clear. They become muddy. Also during that time I had leaf issues. Now with the Blue Lab I may at the end of flower have tiny tips of nutrient burn and it doesn't matter by then I m o . ( currently add Terpinator and Bloom to my GH trio.
my leaves are good
ph stands at 6.0 -6.1 no problems thus far