🐠 Koran Angelfish (Pomacanthus semicirculatus)
A Dramatic Transformation From Black-and-Blue Stripes to Speckled Green-Gold • One of the Better-Suited Large Angelfish for Hobbyists • Elegant Adult Fin Streamers
 
📋 The Koran Angelfish, also known as the Semicircle or Halfcircle Angelfish, undergoes one of the most dramatic transformations in the angelfish world. Juveniles are jet-black with bold white and electric-blue semicircular stripes, gradually lightening over 18-24 months into a yellowish-green adult body speckled in blue and yellow, with blue-outlined fins and gill margins; mature adults can even develop long, elegant trailing fin streamers.
It comes from a wide range across the Indo-West Pacific, from the Red Sea and East Africa to Samoa, southern Japan, and Australia, living on sheltered, coral-rich reefs, usually alone or in pairs as adults. Every Koran Angelfish we ship is feeding well.
It's one of the better-suited large angelfish for hobbyists, adapting well to aquarium life and readily accepting most foods, though a diet heavy in algae-based foods matters for long-term health. It's sensitive to copper-based medications, so quarantine treatments need care. It's not reef safe, and will nip at soft and stony corals, sessile invertebrates, and clam mantles, making it best suited to a spacious fish-only or FOWLR aquarium. It's also almost always aggressive toward its own species, so keeping it with other angelfish can be tricky. It reaches up to 40cm, so plan on at least 380L for juveniles, and 830L or more for a full-grown adult.
 
💡 Highlights
🎨 Dramatic Juvenile-to-Adult Transformation: From bold black-and-blue stripes to speckled yellow-green
💪 Adaptable: One of the better-suited large angelfish for hobbyists
🩺 Copper-Sensitive: Requires careful, copper-free quarantine treatment
⚠️ Not Reef Safe: Will nip at corals, invertebrates, and clam mantles
✨ Adult Fin Streamers: Mature specimens can develop elegant trailing fins