Hey guys so I have a plant which is 6 days into flowering. Her upper fan leaves are very yellow especially in the middle. I did some research and I think it could be an iron deficiency, and was just wondering what others think. I believe iron is locked out in higher pH levels; last i checked (about 5 days ago) her pH runoff was 6.8. If this is an iron deficiency caused by high pH what should I do about it? I just watered her yesterday, so should I run some lower pH water (i'm thinking 6.3 or something) through her? or will this cause over watering? I am using fox farm nutes and roots organics soil if that makes any difference. Here's the pic, sorry not the best quality but as you can see the top leaves are very yellow.