I have DIY CO2. I just use a 20 oz bottle and an airstone, which is buried in the baby's tears in the rear right of the tank.
The very front of the tank is dwarf hairgrass and right behind it I have a row of riccia. The only real inhabitants of the tank are a couple of hundred cherry shrimp and some trumpet snails. I will have to start thinning out the snails though, since when I replanted the tank they had a giant snail orgy and now are overpopulating my tank. It was terrible, I had to call the snail cops and everything to break it up.
Two 1 GA desktops, a 5 gallon, a 2.5 gallon, a 10 gallon, a 20 gallon, a 25 gallon, and two 75 gallon tanks, all planted.
I am an expert on algae, so ask me if you have questions. I know how to grow it, just not how to get rid of it.