Oh my Cream mandarine !

It looks since the question you have solved ur problem...for me its too low of rh and not enough light thats what gives me those same problems...also small pots

Looks to me like a root oxygen issue are you growing Kratky ? or has any of the air lines blocked in your dwc system ? I wouldnt say it was nitrogen because that usaually starts on the lower leaves and head upwards they the yellowing would be alot worse too if nitrogen what cal mag are you feeding her ? Coulc be too much or too little of that ph is fine temperture is not fine if your dwc an air temp of 28c will make your water 28c too so that will cause similiar symptoms to thing along with slowing growth dramatically too i know i grow dwc and its summer im having the same issues lol

Hi there from what I can see you have quite a lot of growth in the shade. You could remove a couple of fan leaves but I'd be more tempted to clean up some of the lower stuff cos it's not going to amount to much.

Hi there,only defoliate if there is a good reason.Like do some defoliation to lower down tent humidity,to make a good air flow if too bushy.Defoliate some leaves If they are damaged or shaded below the canopy.May be some lollipopping if there are too many popcorn buds underneath.Other than those, shouldn’t do.Those fan leaves are acted like extra sources of energy for plants.Only recommend to defoliate at the start of flowering circle and again at 3rd week of flower or at the end of stretching period.Later that period ,you shouldn’t stress the plant anymore and let her grow happily until harvest.Defoliation or lollipopping at late flower stage could even lead to hermaphrodism.Happy Growing... ✌️