As you will see in the video, the old growth of the plants look terrible. That was before the DIY 3 2L bottles of co2 and regular liquid ferts. This took place just after a 40% water change. Is the bubbles coming up from the plants photosynthesis? Enjoy!
http://www.youtube.com/watch?v=pNv7GLBNnBQ
http://www.youtube.com/watch?v=pNv7GLBNnBQ