I have a 20 gallon planted community tank which is my favorite tank. I actually just updated my profile with 2 pictures of it and updated the info about it.
Few things about my tank that seems to work for me:
Co2: Nutrafin Plant System Co2 that hangs on side of tank, my plants grow much better when Co2 is present. Ive also found a constant Co2 injection over dosing with Flourish Excel is better, least in my case.
Filter: Whisper Power Filter for 20 gal
Ferts: I dose with Flourish Comprehensive Plant Sup. & Flourish Trace
Plants: Mostly fast growing plants, which I trim every week or so when i do my 20% water change. Those plants grow nicely and usually I have to trim them because they will cover the surface and then it gets dark in the tank.
Few slower growing plants, like Java Fern
. My Java Fern
leaves dont get real big, but there are lots of little leaves growing off of the mother fern that I first put in there, which I have used to decorate 2 other tanks in my house with.
Light: I tried fluorescent lighting over the tank, but didnt see great results, granted I'm a college student and dont have the money for some of the higher end stuff. I got an older incandesent top out of storage and put 2 spiral bulbs in it, in the range of 3-4 wpg. Works pretty good for me.
I see very little algae in the tank, and whatever does grow, usually happens when my co2 runs out(which is a good hint for me to start a new batch of yeast), but I have 2 oto's in the tank amongst some shrimp and they keep it pretty nice looking. I also have several Rams in the tank that find it pretty comfortable since they spawn just about every week and a half.