Read them? I use them as a guidelines and starting points! Your philosophies are taken to heart by me when I start researching issues to address problems. I definitely do not want you to overdose CO2.
What I am suggesting is that because of your higher light output from the MH pendants, I feel like you might be injecting CO2 possibly on the lower side of the recommended PPM. I think that there is a direct relationship between light intensity and CO2 injection. When you have a tremendous amount of light penetrating the tank such as yours and mine, I feel that it sometimes warrant injecting CO2 at slightly higher levels to keep things balanced.
If I were going to tweak the CO2 as a possible remedy to the situation, I would do it alone without making any other changes to the system/setup/parameters. I would make the changes in very small increments as to not throw the entire system out of balance. I would also let a minor change go for a week before assessing the impact. If I did start to see results, I would probably back off of the tweaking and possibly even go in a lower direction to see if I could manipulate the algae and get it to become worse again. Based on what I have seen with my own personal setup, the results can be clearly seen in a relatively short period of time. If you are at 20 PPM of CO2 right now with the GDA, then maybe 25 PPM is an optimal rate to keep things balanced out.
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