i was reading a thing on nutrient defficency last night & i thought it was magnesium. i don't think it's the light cos it's like 6" away. the PH of the water is always 6.5, i have no idea about the PH of the soil. would i be better off getting a PH pen? i've got an old school digi thing, you fill the tube with water & stick it in this thing & it reads the PH.
anyway heres the pics
oh yeah the tips of the leaves are really brittle