Heres a link to my ghetto-fabulous DIY CO2 injection I run two 1 gallon apple juice bottles in series. I'd rather use suger and yeast than waste CO2 i could be welding with on some nasty fishies!

Tank is stocked with:
6 giant danios ( i regret getting these. Big, very very fast, not aggressive, but they intimidate everyone)
10 yellow long fin danios( wife picked these, very very cool top dweller, my favs)
25 algae eating shrimp (yamatos) (i like watching these guys work. its hypnotizing)
10 ghost shrimp
8 otos
3 SAEs (wierdo catfish us plant tankers keep that eat algae)
1 farwalla
3 bettas (1 male 2 female) (Dont discount these in planted tanks, they rock, very interesting fish)
12 red serpia tetras (these guys hide in the weeds since i added the danios *sigh*)
4 Harlaquins
5000 malaysian trumpet snails (approx.. rofl.. you count em if you care )

As you can see, im a little heavy with about 100" of fish (thats counting the shrimp tho). Nitrates are good, plants are healthy, im feeling ok, especially with all the happy fast growing plants. I'm at capacity, but the system is well balanced.