Thoughts on what is wrong, Hydroponic Grow Help Needed

[StevOz]

I would start by giving it a mild dose of 3% Hydrogen Peroxide daily to kill any pathogens that may not be visible and that should see them recover, grow new unaffected roots and prevent any further damage being done to the effected roots.

Lets see your BUD Porn (you know you got some)

What the hey, root porn shot, I nearly lost these at 5 weeks when a 4-day heatwave hit and the dreaded black root rot took hold, it took a week’s worth of daily 100ml shots of 3% hydrogen peroxide before they recovered, you can still see the dark band on the roots! [roots]