The Koran Angelfish, also referred to as the Semicircular Angelfish or Halfcircled Angelfish is a very popular and tough angelfish. In adulthood the color of the body is a green-yellow that runs from light to dark, moving forward and backward along the body. Some areas appear speckled blue while darker areas display an appearance that is more yellow-speckled. The head is plain yellow-green color with blue sapphire eye rings and gill margins. Also, the fins have been highlighted with sapphire blue. The juveniles are black with blue and white stripes. The Koran Angelfish requires 250 gallon or more tank that has plenty of live rock to hide and eat slime algae and cyanobacteria. It can be prone to nibble at stony and soft corals (sessile invertebrates) and clam mantles, so it's not a suitable choice for reef aquariums. A diverse diet of Spirulina and marine algae top-quality angelfish preparations, as well as mysis, or frozen shrimp, should be provided 3 times per day.