DWC question.

I thought the water level of dwc should always be below two inch net pot, but after the roots have grown all the way down to the end. The plants were having over watering symptom, so I saved it by lowering the water level about 8 inches from the bottom.

Can anyone provide clarity on this? What should be an adequate amount of water level once there is abundant roots.

as long as your water is well oxygenated, it shouldn't really matter. some will say what you did, some will say differently, I think it doesn't matter. add more pumps maybe or lower the temps of your res