Andy Sager
Aquarium Advice Addict
Wow, sorry about that. Here's the link:There is a specie of Angel called P. leopaldi which is also called the dwarf angel. It's not as easy to find and doesn't come in the multitude of colors as P. scalare do but they are better suited for the smaller aquarium. Here's a link that describes the 3 different types of Angelfish. The dwarfs are the last part near the bottom of the page.
Hope this helps.
Freshwater Angelfish Species Profiles and Natural History