Hey guys, I can't believe I did not see this discussion earlier... I blame JCO for getting rid of the portal... GRRRRR

Badflash you are right, but my understanding is that the gas exchange in short water columns like we have in most of our systems is minimal compared to what occurs at the surface of the water.

ANYWAY, I have asked Dr. Wilson Lennard to provide me some of the research he has been privy to over the years to share with you guys, but according to him the gas exchange at the surface compared to the gas exchange from bubbles beneath is 50:1. This is pretty significant... I will post when I get a reply. There has to be some good research floating around the web here somewhere as well...