Grow Mediums Drooping leaves, root rot or something else?

[Smiffy_420]

Morning lads, i have a c99(photo) clone in a single dwc set up, apart from it taking a month and half to root amd going into flower while rooting (under 24/0) all was going well, untill tuesday when the leaves started to droop, i checkd ph it was 6.4 so i lowered to 5.8, still no change in the plant.

My set up is:
3500k led bridgelux strips
2.5liter dwc
Genral hydroponics nutes, 1/2 strength lucas formula
Temps 23-27'c
Water temp 14'c
Rh 40-55

The longest oldest roots are slightly brown, the newest roots are pure white

 

[Smurfdope]

Looks like a mute lockout due to pH. And Probably started with pH being to high. Change your res and make sure to keep your pH between 5.5 and 6.0. I’d carefully trim the brown roots off and make sure the roots are getting enough oxygen. I’d also switch the light schedule to 20/4 or 18/6. They need the dark cycle.