Over Night

So I went in to water my ladies this morning to find this.....majorly disappointing. . I noticed one or two leaves had browning tips that were curling upwards otherwise she has been super healthy and powering through the beginnings of flower, stacking and stinky.

Im running an ES 180 LED at 15 inches away.
5 gallon fabric pot
Kind soil super soil in the bottom and roots organic on top
RO and roots organic cal mag and earth juice UP crystals
Had 4 teas I think so far

Any help would be greatly appreciated because this one has me stumped. Its not Light burn I dont think because there are other tops that are higher that are unaffected. Could be PH because im not watering to run off and ph adjuster is building in the soil. In which case Im fucked because I cant flush my soil Ill loose all my nutes.

Thanks!

Looks like signs of nute burn to me with some heat stress thrown in. The older leaves a ways down from the top will show the effects first but it'll work it's way up. The older leaves have had more time to accumulate nutrient salts in their tissues and the curled up margins are a sign of heat stress as they do that in an attempt to better cool themselves. As they do that they are transpiring more water which draws more nutes into that area causing toxic salts buildup which is what burns the tissues.

I'd run some extra RO water thru them to reduce the nute level a bit and raise the light a few more inches if you have room. No need to pH RO water until you add nutes to it then you may need to adjust depending on how the nutes affect the pH but you shouldn't really need to mess with it using organic soils.

Good luck!