Juvenile Koran Angelfish Pomacanthus semicirculatus with dark body and vivid blue-white semicircular markings
Koran Angelfish (Pomacanthus semicirculatus) native range map showing its Indo-West Pacific distribution from the Red Sea and East Africa to Samoa, southern Japan, and Australia.
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SKU: WC S2303

Koran Angelfish – Pomacanthus semicirculatus

$129.99
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Size: 2-3 inches
The Koran Angelfish (Pomacanthus semicirculatus) is a large Indo-Pacific angelfish recognized in its juvenile stage by brilliant blue-white curved markings over a dark body and its dramatic transformation as it matures.
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All of our conditioned saltwater fish undergo professional observation, quarantine, and proactive treatment protocols to help ensure healthy, stable specimens for long-term reef aquarium success. 
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Description and Care

Quarantine and Conditioning Started on 9/18 - Release Date: 10/8
If you wish to purchase this fish before the release date we will hold the fish for you. Let us know your desired ship date. If there is an issue during the Quarantine process, we will issue a refund.

The Koran Angelfish (Pomacanthus semicirculatus), also called the Semicircle Angelfish, is a large Indo-Pacific angelfish with dramatically different juvenile and adult coloration.

Juveniles have a dark blue-black background crossed by curved blue-white bands. As the fish grows, those juvenile markings gradually disappear and are replaced by the very different adult pattern. FishBase reports that this transition generally occurs between approximately 8 and 16 cm in length. FishBase

The species occurs throughout the Indo-West Pacific, from the Red Sea and East Africa east to Samoa, north to southern Japan and south to Western Australia and New South Wales. Adults can reach 40 cm standard length, approximately 15.7 inches. FishBase

Juveniles favor shallow protected habitats, while adults are associated with coastal reefs offering substantial coral growth and hiding places. Natural foods include sponges, tunicates and algae. FishBase

This specimen is wild collected from Indonesia and is offered as one of Dr. Mac's Quarantined and Conditioned Fish.

Care Guide

Scientific Name: Pomacanthus semicirculatus (Cuvier, 1831)
Common Names: Koran Angelfish, Semicircle Angelfish
Family: Pomacanthidae
Origin: Indonesia
Availability: Wild Collected – Conditioned & Quarantined
Care Level: Moderate
Temperament: Semi-aggressive / territorial
Reef Compatibility: Reef compatible with caution
Minimum Aquarium Size: 180–220 gallons recommended for long-term adult care
Maximum Size: Up to 15.7 inches (40 cm) standard length FishBase
Diet: Omnivore
Temperature: 75–80°F
Specific Gravity: 1.023–1.026
pH: 8.1–8.4

Aquarium Requirements: Provide a spacious aquarium with excellent filtration, substantial swimming room, and rockwork that creates caves and sheltered areas. Plan the aquarium around the fish's eventual adult size rather than its juvenile dimensions.

Temperament: Adults can become territorial, particularly toward other large angelfish. Appropriate tankmate selection and sufficient space are important.

Reef Compatibility: Reef compatible with caution. Large angelfish may investigate or consume sessile invertebrates, making individual behavior an important consideration in reef systems.

Diet and Feeding: Provide a varied marine diet that includes preparations containing sponge material and marine algae along with mysis shrimp and other suitable marine foods. Sponge, tunicates and algae are documented components of the natural diet.

The Pacific East Conditioning System

Every fish undergoes observation, conditioning
and proactive treatment before release

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New arrivals are acclimated,
and inspected

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We proactively treat fish during conditioning rather than simply holding them

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Fish are closely monitored for feeding response, behavior and overall health.

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Fish are transitioned onto prepared foods and conditioned for aquarium life.

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Arrival and release dates help verify proper holding and conditioning time

"A properly conditioned fish adapts better, feeds more consistently, and has a stronger transition into aquarium life" - Dr. Mac

Every Fish is Evaluated to Ensure it Meets Our Health and Quality Standards

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Common Marine External Parasitical Diseases

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Marine Ich

A common and highly contagious parasitic disease that
 affects marine fish in both wild and captive environments

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Marine Velvet

A parasitic dinoflagellate that infects marine fish and
can progress rapidly if not treated early.

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Brooklynella

A ciliated protozoan that infects the gills andskin of marine fish

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Flukes

Parasitic flatworms that affect gills and skin

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Show image
saltwater-fish-disease-ich-pea-6

Marine Ich

A common and highly contagious parasitic disease that
 affects marine fish in both wild and captive environments

Show image
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Show image
saltwater-fish-disease-ich-pea-6

Marine Ich

A common and highly contagious parasitic disease that
 affects marine fish in both wild and captive environments

Show image
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Order FAQs  

About Our Facility

Q: Are your corals aquacultured?
A: Yes. Many of our corals are grown in our Maryland Certified & Licensed Coral Aquaculture Facility.

Q: Why choose aquacultured corals?
A: Aquacultured corals are:
- More sustainable
- Better adapted to aquarium life
- Typically hardier than wild specimens

Q: Who selects and grows your corals?
A: Our corals are grown and curated by Dr. Mac a Board Certified Veterinary Pathologist with decades of hands-on reef experience.

Ordering & Shipping

Q: What does WYSIWYG mean?
A: “What You See Is What You Get.” The exact coral shown in the photo is the one you will receive.

Q: Can I request a specific color or variation?
A: For WYSIWYG items, what’s pictured is what you get. For non-WYSIWYG items, we do our best to match color and size, but natural variation occurs.

Q: Can I combine multiple orders to save on shipping?
A: Yes—contact us before shipping and we’ll consolidate when possible.

Q: How are corals and fish shipped safely?
A: We use insulated boxes, temperature control (heat/cold packs), and overnight delivery to ensure safe arrival.

Q: What days do you ship?
A: Typically Monday–Wednesday to avoid weekend delays.

Q: Do I need to be home for delivery?
A: Yes—someone should be available to receive livestock immediately.

Q: What if my coral or fish arrives dead (DOA)?
A: Contact us within a specified timeframe (e.g., 2 hours) with clear photos, and we will resolve it quickly.

Q: What voids the guarantee?
A: Missed deliveries, improper acclimation, or delays beyond our control.

Live Arrival Guarantee

Q: What if my coral or fish arrives dead (DOA)?
A: Contact us within a specified timeframe (e.g., 2 hours) with clear photos, and we will resolve it quickly.

Q: What voids the guarantee?
A: Missed deliveries, improper acclimation, or delays beyond our control.

Acclimation & First 24 Hours

Q: How do I acclimate new livestock?
A: Float to match temperature, then drip acclimate before placing in tank.

Q: Should I dip corals before adding them?
A: Yes but be careful, coral dips help prevent pests but use caution. Certain corals might benefit from a short quarantine period instead of a dip so as to further stressing them.

Q: Why does my coral look closed or stressed?
A: This is normal after shipping—most corals open within 24–72 hours.

Aquarium Setup & Compatibility

Q: Where should I place my coral in the tank?
A: Placement depends on the coral type (LPS, SPS, soft). Lighting and flow requirements vary—check each product description.

Q: Can different corals touch each other?
A: Many corals have sweeper tentacles and can sting neighbors. Always allow space.

Q: How fast will my coral grow?
A: Growth depends on species, lighting, water quality, and feeding.

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