On the contrary, a few of my tanks have reached the point where you no longer have to scrape algae from the glass and equipment. That said they have all been all medium-light, low tech tanks, I have no experience with pressurized CO2 injection.
In my experience what seems to work is a heavily planted tank, it doesn't seem to really matter what plants, you just need a bunch of them and some floaters like Frogbit or Salvinia. I always use ADA aquasoil or Fluval Shrimp Stratum as substrate. And then I stock a little on the heavy side, for example my 5.5 has 9 guppies and about 50 RCS right now.
I feed the fish generously 2-3 times a week and only dose excel per dosing instructions everyday that I remember to, and change 1.5 gallons of water every 10 days or so.
I tried to keep nerite and ramshorn snails but I think they slowly starved since I didn't supplement their diet. Every once in a while I see a ramshorn, but I do not think there are more than a handful left in there.