Koran Angelfish - Pomacanthus semicirculatus
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The Koran Angelfish (Pomacanthus semicirculatus) is a stunning saltwater fish known for its dramatic color transformation from juvenile to adult. Juveniles display bold black bodies with striking blue and white vertical stripes, while adults develop a speckled blue body with dark blue front and rear sections, accented by a vertical band of greenish-tan. This semi-aggressive angelfish adds elegance and vivid color to large reef aquariums.
Common Name: Koran Angelfish
Scientific Name: Pomacanthus semicirculatus
Family: Pomacanthidae
Size: Up to 18 inches (45 cm)
Temperament: Semi-aggressive
Difficulty: Moderate to Difficult
Reef Safe: No
Native Region: Found throughout the Indo-Pacific, including Indonesia, the Philippines, and northern Australia, typically inhabiting coral-rich reef slopes and lagoons.
Tank Size: Minimum of 180 gallons
Temperature: 74–80°F (23–27°C)
pH: 8.0–8.4
Salinity: 1.023–1.025
Substrate/Decor: Provide extensive live rock for grazing and hiding, with open swimming areas; maintain stable water parameters and mature reef conditions.
• Behavior: Semi-aggressive; may defend territory, especially toward other angelfish.
• Diet: Omnivorous—feeds on sponges, algae, and high-quality angelfish diets.
• Tankmates: Best with other semi-aggressive species; avoid keeping with very small or timid fish.