I've started to notice that since using the rhinox 5000 glass diffusor instead of my old bubble ladder, my pH controller has not been running the co2 as much. I'm talking I barely ever see the co2 on, maybe 3 hours a day total. I know that the diffusor is a much better method than the ladder, but algae has been biting me on the @33 as of late. I have kept the bubble rate the same as when using the ladder. Now my question is since one of the proposed biggest improvements over the diffusors than other methods is direct contact of the micro bubbles with the plants, I'm beginning to wonder if I should slow the bubble rate so that I can maintain the co2 levels but much more slowly so that the bubbles are constantly flowing in the tank? Could the micro bubbles possibly be collecting under the pH probe and causing the controller to shut off prematurely? My tank has literally went from beautiful to absolute crap in the last month since installing the diffusor. Maybe I should just hook up the co2 to the light timer and dissconnect the ph controller. What do you guys think? Has anyone else experienced the same problem?