This was pretty fascinating. I agree with the micropore idea for passive gas exchange although some of the gases leaving would be fairly pungent (ammonia for ex

This was pretty fascinating. I agree with the micropore idea for passive gas exchange although some of the gases leaving would be fairly pungent (ammonia for example). I am wondering if you could put a tube in the water, vertically along the side which was facing sunward. Then using the heat from the sun to heat the water in the tube which would rise enough to create a natural aeration drip.