Little Shop of Coral
Koran Angelfish (Pomacanthus semicirculatus)
Koran Angelfish (Pomacanthus semicirculatus)
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The Koran Angelfish is a true showpiece angelfish with one of the most dramatic transformations in the hobby. Juveniles are famous for their electric blue and white swirling patterns, while adults develop a bold green to blue body with lighter edging and a powerful, commanding presence. This species is best suited for large, stable aquariums and experienced keepers who want a centerpiece fish with big personality and long-term growth potential.
Why we love it
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One of the most iconic juvenile to adult color changes in marine fish
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Stunning patterning and strong presence as a centerpiece fish
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Hardy for a large angelfish when kept in the right environment
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Great choice for fish-only displays and aggressive community tanks
Care & Compatibility
Care Level: Intermediate to Advanced
Temperament: Semi-aggressive
Reef Safe: No
Diet: Omnivore
Adult Size: Up to ~15"
Minimum Tank Size: 180 gallons recommended (250g+ ideal long-term)
Feeding
A varied omnivore diet helps maintain colour, body weight, and long-term health.
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Frozen angelfish blends and quality frozen reef foods
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Mysis, brine shrimp, chopped seafood
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High-quality pellets formulated for angels
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Sheets of nori and algae-based foods for variety
Feeding 1 to 2 times daily is typical, with smaller portions more often being even better.
Tank & Setup Notes
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Provide lots of swimming room plus rockwork for grazing and shelter
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Strong filtration and oxygenation are important due to size and feeding needs
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Stable salinity and temperature are key for long-term success
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Add rock structure with caves and overhangs so it can retreat when stressed
Compatibility Tips
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Best with larger, confident tank mates in big systems
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Can become territorial as it matures, especially toward other angelfish
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Not safe with most reef invertebrates and corals. It may nip at corals, clams, and many sessile inverts
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Avoid housing with timid fish that may be bullied in smaller setups
Acclimation & Health
Slow acclimation is recommended. Quarantine is ideal when possible. Juveniles typically adapt faster, while adults may need more time to settle. Once established and feeding well, this species is often hardy, but it requires space and stable water quality to thrive.
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LIGHT
LOW: Place coral at the bottom of the tank. Depending on the type, coral may need to be placed off sand and therefore mounted on a ceramic disc of piece of rock.
MEDIUM: Place coral at mid-range of the tank. Best placed/glued on top of a rock scape at mid-range height.
HIGH: Place coral from mid range to just below water level. SPS coral are shallow growing so they require and are able to tolerate intense light.
FLOW
LOW: Most soft coral do well with a small, gentle pulse. There are certain corals that can even be placed in areas of indirect flow, meaning places aside a rock structure or set into a entrance to a cave style space.
MEDIUM: Many LPS types of coral prefer medium pulse current. Most Euphyllia or corals that have more tissue structure connected to their skeleton, don’t like to be in a high flow area like the direct flow of the wave pump.
HIGH: Similar to high light, SPS enjoy being in some heavy current. Most LPS and SPS that branch encrust or plate prefer high flow that simulates the top water waves.
SKILL
ENTRY: While some may say beginner level, "Entry" is a good term to be used when starting out in the world of corals and marine life. Prior to adding livestock, you want to ensure that your reef has the proper parameters including zero levels of ammonia and nitrite. Seeing traces of nitrate in your waters is a good sign - just keep them at a lower level of 2ppm to 10ppm. Maintaining correct temperature and salinity are a huge factor to stable parameters. Starting to monitor your PH, alkalinity, calcium and magnesium is a great habit to get into to keep a successful reef.
While some soft coral don’t require too much light, having a proper reef light that puts out the proper pars is very important. You'll also want to have a good amount of flow and protected rock areas, as placing corals in their happy spot is ideal for success.
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