I have a dirted 40g Breeder that is pretty low tech right now. It has my old light from my 20g on it with a makeshift light holder. No ferts and pretty heavily planted with various Crypts and a couple unidentified plant species. My wife got me a new light fitting that is the correct size for the tank and it holds two bulbs, one is a T5HO 39W Flora Sun 5,000k lamp and the other bulb is T5HO 39W 6,500 Ultra sun bulb. I would prefer not to have to run CO2 in the tank, is this lighting going to be so high that i will need to run CO2? Could i run just one of the bulbs and keep the tank as pretty low tech? Advice would be appreciated.