Hey, Calimebob! I think this is the best 1st grow I've ever seen, kudos for the balls to go all out. IMO, you have a fungus in your grow room, probably leaf spot fungus or LSF. I had it for over six months, and I thought it was everything from ph problems to nutrient deficiency. It affected some strains more than others (really bad on the Trainwreck, but hardly touched the og kush), but it does reduce yield, more than I thought at first. It seems the yellowing is starting in strange, random places on the leaves, and it doesn't seem like 1100 ppm is gonna crisp leave up like that. There are anti-fungal sprays on the market, but they kill good and bad fungus. I was foliar spraying my plants with microbe tea which seemed to make it better, but I am now spraying with Trichoderma Harzianum and I'm almost LSF free. It's important to spray 2 or 3 times per week, and dipping your clones as soon as you cut them has the greatest beneficial effect (Harzianum attacks other fungi and mold aggressively, but is beneficial to your plants). My girls are now taller and greener than ever! I could be wrong, but if you find the problem isn't with your PH or ppm levels, you may want to take this tack. Good luck, I'm subbed...