Just like the title says... everything was going good until one plant starting getting some brownish spots on the lowest set of leaves, the 2 larger first leaves. Then, a couple days later I check on them after I watered the day prior at 6.8 and runoff was 6.8, and now 3 or 4 plants have these spots!! I thought it might be the rust mold or something so I hit it all my plants with a light spray of 'Safer' Garden Fungicide which is OMRI listed just in case. But the more I think about it the more I feel like it's a ph issue. If it's in promix, which is basically hydro, should I have it lower than 6.8, like 6.2?? I was going to use this anyways as a preventative but sure enough with my luck my plants are acting funky! I'll attach pictures (Actually I can't I'll link my journal since it won't let me http://www.marijuanapassion.com/forum/showthread.php?t=66265.) And more on the setup- 4x2 tent; temps 78-80 ; humidity 40-50 ; 465cfm fan sucking out of the top ; passive intakes at the bottom; and 2 fans inside, one pointed at the lights and one oscillating pointed a the plants. All the plants are dancin. It's about time to feed anyways as I only added about 3 parts HF to 10-12 parts Promix just to start the seedlings off in and give them that extra mychorriaze(sp) for root development. Oh, I also added a little lime to help buffer ph, as recommended by other Promix growers. I don't know if they're just deficient and the ph is off, ready for food, deficient in cal/mag which I have an actual cal/mag or epsom salt, or if the little bit of nutrients in the HF can't be absorbed because of the ph or what? Any input would be grrrrreat because this is really bothering me. I'm stumped. I had perfectly green plants a few days ago and BAM ugly rust spots ironically after watering. No bueno. Should I flush them, feed, and hit with some cal/mag? Or is it something worse......