At lunch I was looking at my passive hydroponic tubs that were a failed experiment due to water level fluctuations and something
@Neb had said hit me, I also had some 1/4" drip fittings and it hit me, can I install a drain through the wall of the container and
not have it leak? If so I can run a pump to maintain a constant fluid level and flow, I still need to figure out how to have easy serviceability (remove tubs to service/harvest/plant) and connect the lines. So I drilled a hole in one, pushed and elbow into the hole, set the tub into a tray (don't want water on the floor), and then filled it up to the top of the elbow (pointing up). If it doesn't leak it will give me a way to make another run at hydroponics.