Originally Posted by ThatGuyWithTheFish
Nah man, there are TONS you can do in a 20. Just not a lot of room for variety. Tetras, rasboras, dwarf cichlids, cories, barbs, livebearers, list goes on and on.
I agree. I'm not saying there aren't many varieties of fish you can fit in a 20g. I am saying that there are many that you *can't* fit in a 20g, and the OP needs to understand space limitations.