Does anyone know what would cause this, all plants in both hydro containers are doing this, one batch is 7 wks of 12/12 and the other is 5 wks of 12/12. I also noticed that my mother plant in soil is doing the same thing. I dont think its a nute deficiency as the hydro tubs have different mixtures of nutes and the mother is in soil. I have just used a foliar spray of pirhana and put straight ph adjusted water into the resevoirs, the 7 wk batch had to go into the flush cycle anyway. the leaves start to curl upwards from the tip then slowly turn brown and die. If u hold one of the leaves up to the light u can see dark blotches in the leaf. I think i may be having a problem with some kind of fungi or bacteria but the buds look good so am lost as to what the problem is.