Leaves yellow

Hey there Dave, i have to disagree with my growmies on this one : you actually have Nitrogen Lock-out , not deficiency, this you can see from the "very dark green color" on some plants, the burnt leaf times, the yellowing starting at the bottom of the plant with the oldest leafs first and moving up. So basically i think your nutrient solution was just too strong in N . The good news is that you're already doing the right thing with watering with plain water right now. Keep a plain water, plain water, feed, plain water, plain water, feed, schedule going forward. One problem you're going to start having soon is cal mag deficiency, just re-include it when you're ready to feed again to prevent any issues. Hope this helps ! 🚀