I second the Rams... They honestly have become some of my favorites to keep... Still want to try German blues, but Bolivians have been awesome fish.I keep Rams in my 20L it's a great size for a pair with a few neons or cardinals.
sand bottom. driftwood and a few plants mostly consisting of mosses and crypts. I have a ton of subwassertang and Java moss with some ferns tossed in for good measure.