It is normal to get some nutrient buildup on our roots that will coat them with a brown tinge. But you don’t want to see your roots mushy and soft. Keep your h20 temps around 68f and lots of air to your roots and you won’t ever have an issue with root rot. I run Voodoo Juice most of my grow to keep some beneficial bacteria in my reservoir. I also use Sensizym which has beneficial enzymes in it to break down any buildup in my rootzone.
Condensation on the inside of your tent is not good! You need to increase your nighttime temps and kick up your extraction fan to pull that extra moisture out. That can cause you some serious problems with powdery mildew in Veg, or bud root in flower.
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