
... Firstly we have a great defc. pic depot right here, and a more extensive text read type (JM's Self Diagnosis giude) to use it with -- Both are in the highlighted Sticky section above this...
@bklyndiaz ..mate please don't link people to other sites, it's against TOS and the ones here are better with more extensive info-
...OK, what's the distance to the lights from the tops? And what brand/model lights? ....I too saw the suspect top-biased frying,... I believe it's a combo of low nute inputs, not enough now to keep up with the demand, the lights making this worse by
proximity heat/intensity (not ambient) which in turn is forcing more rapid transpiration in these areas; this makes the "draw" harder on things, and up's demand in a localized way... The symptoms look K (tip and "teeth"/margins browning out) and P defc. (overall paleness, additional margin browning) to me as well, but it's unusual to see it affecting the uppers this much (under typical conditions) since they are both mobile withing the plant and can be translocated from lower fans leaves,.. but with potential light/heat stress, it can happen! ...good that you're going with the higher PK booster,... pH in res' seems OK,.. do you have a ppm/EC reading of it?