I really must point out that if you're going to use "Free Tibet" as your user name, and you're going to mention "Free Tibet" in your first post, then you really need to get a Tibetan flag for your avatar. Just for consistency's sake.
And for a tank as small as a 20, I'd suggest you try to trade or buy from members here. That wouldn't take many plants to fill. If you can afford high light equipment, a carpet of glosso looks great in short tanks.