Root rot or GHE micro?

[extw]

Hey
I think i have problems with my roots

Strain - Sativa Durban Poison (feminized)
# of Plants - 1
Grow Type - Hydro
Grow Stage - Veg
Setup - Bubbler
Light - 250 Watt HPS
Nutrients - General Hydronponics
Medium - Lavarock
PPM - ?
PH - 6
RH - 30% to 45%
Box Temperature - 80 to 88
Solution Temperature - 76 to 79
Room Square Footage - 3 square feet (0.25m2)
Pests - None Known

My roots gets light brown color.
day 12:

High res

and 12 hours later:

High res

plant day 13

more photos here:
Durban Poison in the Bubbler - First Grow

This is root rot or this is only GHE micro? (i changed solution one day before this happen, and i put more ghe micro than previous)
They don't smell.
All sugestion appreciated.

Cheers!

 

[SSNUGS]

looks like nute discoloration. You may want to try some hygrozyme in you res and it will do wonders with your roots.

 

[MedScientist]

Your roots look GREAT! It looks to be just nute discoloration. Dont worry about it, the staining wont hurt the roots.

Good Luck!

 

[Dankafied]

yeah they just looked stained. root rot looks a lot funkier than that! and smells even funkier!

 

[extw]

Thanks all for input.
It seems it's just nute stain.
After two days there are no bad small and plant is still growing fast