I'm not sure where any data is

, I just tried it because it seemed like it would work and it did.
Now that I think about it, I did take some readings which are mentioned in the article
RDP pH Control and Filtration in the February 2002 Sea Star Online which discusses my success with the technique. It mentions the mechanism as well as I understood it at that time. The O2/CO2 relationship in the water and that pH is a function of CO2 is better left for you or some of our resident Chemists and Chemical Engineers to describe.
Since every tank/system is different, I don't know if any definitive statement can be made regarding size and lighting requirements to handle x number of gallons in a main tank. My philosophy has been to put as much or more light on the refugium as the main tank and to make the refugium as large as possible. It seems like refugium size anywhere from 10% to 25% of the main tank capacity does the job.
I've got to say that you(BananaTropics) have done excellent on both those factors! Your tank & refugium are very nice. BTW, that SPS frag you gave me was lost in the mangrove roots in the bucket overnight. I took it out and stuck it in the sand of the refugium and that's where it's still growing right now(2 wks later)! It's a hardy SPS! Thanks.
Edited by Mark Peterson