Description

The Koran Angelfish (Pomacanthus semicirculatus), also known as the Semicircle Angelfish or Half-Circle Angelfish, is a striking and popular marine species, known for its dramatic transformation from juvenile to adult. It’s a favorite among advanced aquarists due to its vibrant coloration and distinct personality.

🔷 Species Overview

• Scientific Name: Pomacanthus semicirculatus

• Common Names: Koran Angelfish, Semicircle Angelfish, Half-Circle Angelfish

• Origin: Indo-Pacific (Red Sea to Fiji, Japan to Australia)

• Size: Up to 15 inches (38 cm)

• Lifespan: 15–20 years (in captivity with proper care)

• Temperament: Semi-aggressive

• Reef Safe: With caution (may nip at corals and invertebrates)

• Care Level: Moderate to difficult

🐟 Appearance

• Juveniles: Deep blue with white curved stripes resembling Arabic script, which gives the “Koran” name.

• Adults: Olive green to yellowish body, blue edges on scales, blue lines on the face, and a crescent tail.

• Color Change: As they mature (around 4–6 inches), they undergo a dramatic color transformation.

🏝️ Tank Requirements

🍽️ Diet

• Type: Omnivore

• Feeding Frequency: 2–3 times daily

• Diet Includes:

  • Spirulina and marine algae

  • High-quality angelfish pellets

  • Mysis and brine shrimp

  • Chopped seafood (clams, squid, shrimp)

  • Sponges (essential for long-term health – many prepared diets include sponge)

⚠️ Behavior and Compatibility

• Temperament: Can be territorial, especially as it matures.

• Tankmates:

  • Suitable with other large, semi-aggressive fish (e.g., tangs, wrasses)

  • Avoid housing with smaller or docile species

  • Best kept singly (not with other large angelfish unless the tank is very large)

• Coral Caution: Known to nip at soft and stony corals, and some invertebrates (sponges, clams).

🛠️ Care Tips

• Quarantine before introduction to the main tank

• Provide varied, nutrient-rich diet

• Regular water changes and testing are vital

• Monitor for common marine diseases like ich or HLLE (Head and Lateral Line Erosion)

✅ Pros

• Stunning appearance, especially the juvenile stage

• Long-lived with proper care

• Active and intelligent

❌ Cons

• Requires a very large tank

• Not fully reef-safe

• Can be aggressive and territorial