Yellowing leaves at bottom!

So my issue is that the leaves are yellowing from the bottom, I hope that the reason for it is lack of light and not nutrient related. You can also see a lot of the pistils turning brown, I believe the reason for it was the heater turned my tent up to 35c and cause it to stress somehow, but they have stopped turning brown so guess I’m good there. There is absolutley no nanners on her. So she is not pollinated.

some info
Strain: Strawberry Gorilla Auto
Age: 5 weeks
Medium: 25Liter fabric pot, with hot soil mix
Ph:6 (run off)
Ppm:1.8
Temprature:28c
Humidity:40%
Light:Mars hydro ts600, running 24/7
Water her twice a week and only fed her twice during her life. I fed her today with liquid nutrients, but the EC went up to 2.6 so had to flush her down to 1.8. As you can see on the top, she kind of some nutrient burn. As for the moment, most of the leaves have a healthy color, I just hope the yellowing does not spread upwards. You think it some nitrogen def?

Everything looks fine to me, maybe a little ph drift, MAYBE a little N deficiency but honestly the issues aren't really severe enough to warrant drastic actions that will likely cause other problems instead, just keep feeding and keep that PH in check,

Looks good to me. Might trim out some of that lower stuff anyway.