Really enjoying the discussion of the sneaky roots. Running the flood and drain, I've ran into a few root issues. My first time running with the flood and drain pvc tray cover, the plants had gotten kinda large and the flood had been over for 45 minutes and the reservoir was still half full. My roots in the tray had started following my inflow hose back down into the reservoir. No fun. I solved it by cutting a maintenance hole in the top of the pvc tray just a little to the right of dead center above the inflow and overflow in the tray. A little to the right because I'm right handed. It would have been nice to have a youngun with small hands. So, every so often when I'm doing my daily checks, I move the maintenance cover over and reach in and clear the roots on my screened over inflow hole. One grow I put the tray cover on, and didn't pay attention to the position of the maintenance hole. It was on the left now. Real pain in the arse the rest of the grow trying to do it with my left hand.