Hey guys I have a 40 gal tank 18" high. I currently have T5NO dual output fixture with a 21W 6.700k bulb and a 21W colormax bulb. I am trying to gain some more light for my plants, and also aesthetics. I am looking at the Odyssea T5HO fixture but am I going in the right direction. Im not really looking to go the C02 system way, but I will continue to dose Flourish Excel. Will this light get me to the High end of low-Medium light? Will this much light promote a algae problem, and would I have to inject CO2? Thanks for your help.