Well, I've been using
floralicious for most of the flowering stage. Very stinky stuff. And today I was leaning over the tops to reach leaves to trim, and I was noticing a distinct purple appearance to the uppermost fan leaves. Because the top of the canopy is at eye level, it is hard to see the colors very well.
I topped up the reservoir again and gave EC just below 1.0. Finally got into the tent and pulled water from bottom of each pot during runoff. 3 were the same, at 1080. The 4th was over 1100. I noticed it had much less runoff than the others, so I tweaked valves a bit. And manually dumped several cups of fresh runoff back through each pot with a cup to ensure a good flush.
And found another leak in one of my drain saucers. Sure wish I had a commercial product there.