Hello, I've been growing for a year in aeroponics, encountering every kind of problem and lately relating them to overfeeding.
Something is still bothering me, since the last two cycles I've had superhealthy plants, with a very extended root system, always bright white, the yield was fair enough for my standards, but leaves started to show rust spots starting from the lower branches and slowly reaching the top fan leaves. I thought it could be a cal/mag deficiency, but using a Calcium based fertilizer and others containing magnesium have brought no results. These two autoflowering (fast bud) have ended up worse than others i grew, so I hope they'll be a good example. Furthermore, I'm growing in the same system a feminized Black DOG, which is about two months old, maybe more, but it's just beginning to show the same spots on a few top leaves, while two clones, about 3 weeks from rooting, are growing just fine.
I know it's a mess, but I had to, and beyond any expectations, they are living together just fine. pH, EC and fertilizers were based on the two fast buds life cycle, so they had plenty of PK in flowering and the last two weeks I lowered EC from 1,3-1.4 to 0.7-0.8 mS.