I was working out the plumbing for my new DWC bucket and got a little carried away with ms paint. So now I have to share it, hopefully someone finds it useful. I have it for 2 plants but you can do as many as you want. The idea is ease of use, you can take water readings without light getting into the container. Anyways here's the pic, it explains all.
Oh yeah, it'll actually have 3 pumps for about 15g water, that should do the trick. 1 - 80g pump, single outlet will run a 48" tube which will make a circle at the bottom. 1 - 100g pump, dual outlets will run 2 - 3" round stones placed directly under the pots. 1 - 100g pump, dual outlets will run 4 small stones placed at each corner. Paint rocks, I could use photoshop but why?