Soil? Is water being splashed on the leaves? Kind of looks like that could be your problem but I can't give a definite with the info you gave. Is it on the lower leaves or all of them? New growth or old growth? Does look like nute burn of some kind.
Lit Up Reviewed by Lit Up on . Still fighting Yellow w/brown spots I am hoping someone can help me before this poor plant dies. The stats: Plant was fine prior to transplant. 4 week veg (mother) 400 W halide 20" away Day 74 night 66F Coco / 20% perlite in 7 Gallon grow bag. Well water P.H. 5.6 and cond @ 23 ppm Rating: 5