I don't use a misting method, I use an in line reactor with a dedicated pump. I do get pearling later in the day, similar to water changes but it seems to take a while to develope that pearling. With large water changes I get a lot of pearling and it takes about 20-30 minutes. I called in a couple of favors to borrow a DO sensor, but, Tom how did you use the O2 levels to calculate CO2, won't that depend on plant concentrations and types of plants? I am curious to see where the CO2 concentrations settle out. And in the end if I should need to make a change with the method of delivery. I don't have any problems(major) with algae. There's a certain level of algae, that I don't care much about.