The Dwarf Angelfish - unlike the large marine angelfish, these dwarf saltwater angelfish are for the bulk of hobbyists with the tanks in the smaller size ranges of 30 to 100 gallons. Like their larger counterparts, the dwarf angelfish can be quite territorial in the small confines of the home aquarium. It's best to keep only one of these dwarf angelfish in your tank.
You can usually buy dwarf angelfish at your local saltwater fish store and you can expect to pay anywhere from $20 to $50, depending on the location. They can be relatively hardy if acclimated properly and introduced to an established tank. They will not do well (and will most likely not make it) in a tank going through the aquarium nitrogen cycle.
The flame angel is probably the most sought after of the dwarf angelfish with its dazzling colors, but the coral beauty angelfish can be quite striking as well. Give them a varied diet with plenty of algae matter, live or frozen foods and you should get nice coloration out of your fish. If your tank has live rock you will go a long way toward keeping your dwarf angels happy since they should graze on the rock in betwen meals.
Centropyge bicolor Bicolor Angelfish The front half and tail is yellow with the mid-section being a royal or deep blue. They get to about 6 inches (15 cm) when fully grown and can get aggressive with other dwarf angelfish.
Centropyge bispinosus Coral Beauty Angelfish Gets to about 4 inches (10 cm) and their colors can vary depending on where they were collected. Overall it usually has a yellow body with purple vertical stripes and purple or blue fins. They can also get aggressive with tank mates and may nip corals.
Centropyge eibli Eibli Angelfish This is one of the bigger (up to 6 inches) of the dwarf anglefish. They can easily get cryptocaryon so a qt is strongly recommended. They sport some awesome colors and markings so if you're looking for pretty dwarf angel this one may be the ticket.
Centropyge loricula Flame Angelfish One of the most popular but not necessarily one of the easiest of the dwarf angels to keep. They usually come in with saltwater ich or very shortly show signs of it. Ask to see them eat and let the store keep them for a few weeks before spending the $40 plus on this fish. An amazing looking saltwater angelfish though.
Centropyge flavissima Lemonpeel Angelfish Gets to about 5 inches when fully grown but is not necessarily one of the hardier of the dwarf angel species.
Centropyge potteri Potter's Angelfish Will get to be around 4 inches when grown and needs to be acclimated slowly. Endemic to the Hawaiin Islands.
Centropyge argi Pygmy Angelfish This angelfish isn't usually lumped in with the dwarves and it's sometimes referred to as a Pygmy Angelfish because it only gets to be about 3 inches (8 cm) in size. A very cool little saltwater tropical fish that can be kept in 20 - 30 gallon (113 liters) tanks.