First grow in 10 years, multiple strains

Hello all, sorry been very busy working this week not had chance to update. Buds all seem to be coming along nicely and stacking up in weight. Just a little problem I noticed on my pure kush plant (see photo) leaves turning a very light green colour on the bottom of the plant and spreading to the leaves at the top of the plant. I need to get to the root of this problem. . My thinking is this is a N deficiency or S I’m not too sure or is this normal with this strain? All other girls seem to be liking their feed so I’m not sure. This is my first grow for ten years so any input would be appreciated. I have started to feed her just water for the time being. All in all I’m happy with how things are progressing and I’m very impressed with my lights, before this grow I was unsure how they would perform compared to hps which I used in the past but now I’m sure already these lights perform as good as my sodium bulbs years back . Photos are taken from day 33 of flower . Happy growing ya’ll 😁😁