Desperate, All Plants Dying, Yellowing, Wilting.

Clean out your resovior... Adjust your ph and start with new fresh nutes... All your issues should fix. Do asap and keep track of ph always... oh and cal mag use too, during flower... Good luck.

Take that one plant with the brown roots,get the water down around 62 to 68 degrees, literally take your scissors and cut the brown roots away, set your ec to 1.5 or 6, get your water bubbling good and your ph for flower stage to 6.3. Hope it's not to late. Cheers friend

Do you have enough air going at her roots? I do not grow hydro but I have tried aeroponics once or twice and it really helps the plant, having some of the nut and some air put directly on the roots is something they like I think

Lights are at 16" and 800 PPF. PH was erratic, but I've been keeping it at 5.8 to 5.9, checking several times a day with no improvement for the past 1.5 weeks.

what ph are you at?

Notice the yellow leaves on the best plant are closest to the dying plant and the one I already removed. I've checked and found no sign of insects or visible mold on leaves. Although tan in color, the roots feel healthy and I think they just have some stain from nutrients. They were a little too warm when this started, and air flow in buckets may have been a little low, but both were fixed with no improvement.