Is Co2 really going to be necessary? My 35g Hex has lots of plants that aren't thriving or growing out of control but have slowly been growing and doing well for over a year now with just two 6500k Compact bulbs from Lowes. Preferably I would like to avoid installing a Co2 system because it would keep costs down. I'm still trying to find lighting solutions. I need something sleek and thin that will fit underneath the 20g tank that will be sitting on top of the 55g. I was looking at the Ecoxotic 48" Panorama Pro which is around $300 but I dont know if that will be good for a planted tank, its 10000k and 445nm when plants need around 5500-6500k.