Koran Angel Fish J (Pomacanthus semicirculatus)

Koran Angel Fish J (Pomacanthus semicirculatus)

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Species Name:

Pomacanthus semicirculatus (Koran Angelfish)

General Information:

Pomacanthus semicirculatus, or the Koran Angelfish, is a species of marine angelfish native to the Indo-Pacific region. Known for its striking colors and unique patterning, the Koran Angelfish is a popular choice for medium to large-sized saltwater aquariums.

Tank Requirements:

  • Tank Size: A minimum tank size of 150 gallons is recommended for a single Koran Angelfish. Larger tanks are preferred for multiple individuals or if you plan to keep other large fish species.
  • Water Parameters:
    • Temperature: 72-78°F (22-26°C)
    • pH: 8.1-8.4
    • Salinity: 1.020-1.025
  • Substrate: A sandy substrate is preferred, as Koran Angelfish may sift through sand in search of food and may injure themselves on rough substrates.


Pomacanthus semicirculatus are omnivorous but tend to graze primarily on algae and sponge material in the wild. Their diet should include:

  • High-quality marine-based flakes or pellets
  • Fresh or frozen marine algae (such as Spirulina)
  • Occasional offerings of meaty foods like brine shrimp, mysis shrimp, and chopped seafood

Tank Compatibility:

  • Aggression: Koran Angelfish can be aggressive towards other fish, especially towards other angelfish or similarly shaped species. They may also display territorial behavior.
  • Tankmates: Best kept with larger, semi-aggressive to aggressive fish species. Avoid housing them with small, passive fish that may become targets of aggression.
  • Reef Compatibility: Koran Angelfish are not considered reef-safe, as they may nip at or consume corals and certain invertebrates, particularly sessile invertebrates like corals and clams.

Behavior & Temperament:

  • Semi-Aggressive: Koran Angelfish can exhibit semi-aggressive behavior, especially towards conspecifics or other fish with similar body shapes.
  • Territorial: They may establish territories within the tank, especially in larger systems with multiple hiding spots and territories to claim.
  • Active Swimmers: While not as active as some smaller fish species, Koran Angelfish are relatively active swimmers and appreciate ample space to explore.

Tank Environment:

  • Rockwork: Provide plenty of live rock formations with caves and crevices for hiding and territory establishment.
  • Plants: While not necessary, live rock with algae growth can provide a natural food source and enrichment for the angelfish.
  • Lighting: Moderate to high lighting is preferred, as it mimics their natural reef habitat.


  • Water Quality: Regular water testing and maintenance are crucial to ensure stable water parameters. Perform regular water changes to maintain water quality and remove excess nutrients.
  • Algae Control: Keep algae growth in check, as Koran Angelfish may help control algae but can also be selective grazers.
  • Territorial Aggression: Monitor for signs of territorial aggression, especially if housing multiple angelfish or other potentially aggressive species.

Health Considerations:

  • Quarantine: Quarantine new arrivals before introducing them to the main tank to prevent the spread of diseases.
  • Parasites: Keep an eye out for signs of parasites, such as white spots or abnormal behavior. Treat promptly if necessary.
  • Dietary Needs: Ensure a varied diet to prevent nutritional deficiencies and maintain overall health.


Pomacanthus semicirculatus, the Koran Angelfish, is a stunning addition to a medium to large-sized marine aquarium. With proper care, a suitable tank environment, and a varied diet, they can thrive and become a captivating centerpiece in your reef or fish-only setup. Remember to provide ample space, appropriate tankmates, and regular maintenance to ensure the health and well-being of your Koran Angelfish.