Thanks for your reply!
1. The solution is about 17 degrees C without ice and around 14-15 with ice.
2. The plants have "lived" in that solution for roughly 10 days, i started them in a small cloner type DWC. I have not changed nutes yet, only filled the system up with water.
3. The
nutrient solution is not cloudy
4. The browning started appearing a few days after i moved them to the bigger system. It also feels like they slowed down their growth rate, at least the chilies, but that might be cus they started budding (ive pinched those away now though)
5. That slippery surface is gone now, i can't find it on anything in the system
6.The browning is only on the roots submerged in the solution
Let me get this right, you say that new roots are typical when the roots have grown in a warm solution and then cools down? That makes sense
Because my cloner system only held about a litre of water and so it was always luke warm to the touch. Probably well above 22 degrees celcius. Maybe the roots reacted to the lowered temperature? My DWC was at about 10 degrees celcius when i started it, the water was almost freezing my hands when i dipped them.
I'm using a 150 mm air stone, its a pretty big one, almost covers the bottom of the dwc.