sylvestris
1. You mentioned that you started to use ice to cool the
nutrient solution, what is the temperature of your nutrient solution (before and after)?
2. How long have they been that system and between nutrient changes?
3. Is the nutrient solution cloudy?
4. when did you first notice any browning.
5. Do you feel the same slippery surface on anything else in the system (side of container, baskets, tubes etc.).
6. is the browning only on the roots that are submerged in the nutrient solution?
I see the new white roots growing out, and that's typical when warm nutrient temps cool down again. Tinting from the nuts themselves is normal and possible, however I don't usually see it that dark with roots that young. But I have never used those nutes either. Also I see some bubbles in the water so I assume you have air stones in it, however I cant tell if they are getting enough. Most of the white roots look like they are coming out of the sides of the baskets, so I wonder if they only turn brown when they become submerged.