I think you are seeing a secondary deficiency, probably caused by too much of another nutrient (P or K), or possibly Ph related, since the entire plant looks affected. I only feed once every 10 days, so it is hard to pinpoint with so many products being used. Since you seem to be providing enough nutrients (although I don't know much about the Micro Grow, ) the problem is probably nutrient lockout from a squirrelly Ph level. You best bet is a slurry test, which is simple if you can find the kits. There are a few charts in the infirmary section that can help to diagnose deficiencies, etc. It might be of some help. Good Luck!!