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Never mind, just saw the actinic part. You won't need CO2 with running 2X12000K and 2Xactinic. Your plants should do fine, although I would imagine some dosing will be required. CO2 would also benefit the tank, but you could get away without it.
No. You have plenty of light. I wouldn't worry about the difference from 10000K to 12000K when you have that much T5HO light on your tank. It will work out.