I've posted before but all 4 plants ( Critical purple kush, blue dream, white widow, and a white widow clone) are approx 90 days old and I am in the 2nd week of flowering. They are under a 400w hps, growing in coco, and I'm using the General Hydroponics Flora Grow, Bloom, Micro Combo Fertilizer set, I am following a nutrient schedule found on the grow weed easy site and I supplement with cal mag at every watering whether its nutrients or just plain water.

So far my grow has been relatively uneventful, I had a bout with fungus gnats but I did (2) treatments with neem oil and used nematodes twice- that seemed to alleviate my problem.

Anyone know why I have these spots on my leaves, it seems to be isolated to a few fan leaves but I wanna nip this in the bud( for lack of a better term) before my buds start growing in.