Are you just looking to save money by switching from your PC fixtures to LEDs? You may not save that much money in the end, since LEDs are also a sizable investment.
Your photoperiod seems a bit long; I would reduce it to 8 hours.
For CO2, I would recommend pressurized CO2 for an aquarium your size. For more information, please take a look at my pressurized CO2 article that I wrote (linked in my signature).