Angel In A 20 Gallon

[laknarf]

In one of my tanks, a 20 gallon high I have a good sized angel fish. It's body is larger than a silver $ coin. Only other fish in there is a zebra danio and a bristle nose catfish. All of the (fake) plants are off to one side. What fish can I add to the tank to "liven" it up?

Thanks for any suggestions

 

[Tolak]

The danios should be in groups, as they are a shoaling fish, I might get a few more of those. A trio of livebearers would brighten it up a bit, platys are big enough to not be bothered by the angels, and come in a variety of colors.