Pomacanthus imperator also known as the Imperator angelfish
Approximate Purchase Size: Juvenile Small: 1" to 1-3/4"; Juvenile Medium: 1-3/4" to 2-1/2"; Juvenile Large: 2-1/2" to 3"
Changing Small: 2" to 3"; Medium: 3" to 4" Large: 4" to 5" 
Adult Small: 2-1/2" to 3-1/2"; Adult Medium: 3-1/2" to 5"; Adult Large: 5" to 6" XLarge: 6" to 7"

Minimum Tank Size: 220 gallons 
Care Level: Moderate 
Temperament: Semi-aggressive 
Reef Compatible: With Caution 
Max. Size: 1' 3" 
Origin: Africa, Fiji, Indonesia, Maldives, New Caledonia, Sri Lanka, Vanuatu 
Family: Pomacanthidae