Ok. I found and read the thread. I noticed the part about dripping the efluent through the air before it gets to the sump water. Mine is already set up like this. I guess this is better? Also I guess my reactor is a pretty good size. It was made custom for this tank, by the guy that built the tank. I will continue to play with it, and it appears that I need to check the ph of the efluent to help set the Co2.