Lol. You funny. I say raise it a bit with hort lime. Did you dose them with it when they changed cycles? Or do you not use it? I tell ya, I used alot of it in the recent harvest and it made a huge difference. At 3 weeks into flower, they should not be yellowing. Should have lush green foilage. Everyone, "claiming" there knockig out 1.5g a watt, there pics are lush even at week 9 flower. So maybe they are, maybe not. I guess when I have one that has that last uping of nitrogen in late flower maybe. FF has it, but my foilage was not nearly as dark green as I am seeing others. Looking foward to your crop. There's alot in there. Total watts is 2400?
PS, I still say drop that table and run DWC. Find my other thread, I hope to grow enough in 1 harvest to last my entire family 1-2 years worth. Won't have to have constant grow. Some like it, not me. I am well protected too inside and out of the house, but it's still scary, period.