Yep I due use CO2, my set up is a dupla reactor s, red sea undergravel heating, seachem fertilizers (flourish, iron, equilibrium) and three layer substrate (granit sand, laterliter, 2m gravel, 2x 36w blue planet uv filters, ehime pick up filter, ehime surface skimmer, juwel in tank filter (stock), fluval 405 to run CO2 reactor.
The way I keep my Alge down and close to nill is by using very fast growing plants (wisteria & baby tears) in the background and balance my fertilization accordingly,
My slower growing plants use up most of what ever the fast growers don't there for very little nutrients are left over for alge, and when ever my slow growers seam to need more nutrients I can usually just give the fast growers a good trimming and problem solved.
Oh and ofcourse 30-40% water changes weekly.