Koran Angelfish

Koran Angelfish

The Koran Angelfish is a lovely fish with a yellow-green body that bleeds from light to dark as it travels from the front to the rear of its body.

These beautiful species are fantastic marine fish that can adapt well to an aquarium environment.

It’s commonly called the Semicircular Angelfish because of its scientific name Pomacanthus semiculatus.

In this article, we will go through all the information you need to know about Koran angelfish, from where do they originally come from to how to breed them.

So without further ado let’s go into details.


Fish NameKoran Angelfish
Scientific NamePomacanthus semicirculatus
Common NamesSemicircular Angelfish, Koran Angel
FamilyMarine angelfishes
OriginIndo-Pacific at depths of 1 to 30 meters, found in singles or sometimes pairs near heavy coral cover.
Minimum Tank Size250 gallons
Length16 inches (40 cm)
Ease of Caredifficult to care for – needs a big tank.
pH8.1 to 8.4
Temperature72°F – 88°F
Koran Angelfish characteristics table

Koran Angelfish Origins

Koran angelfish is an ancient fish that was first formally reported in 1831 by the French anatomist Georges Cuvier.

The Koran Angelfish has a specific name that is the reason behind its appearance. The word semicircular angelfish means “half circled angelfish” and refers to those white and blue stripes on their skin that are only found in juveniles, but then disappear as adults grow.

These species are tropical fish that may be found in the Indo-Pacific region, Its range extends from the eastern coast of Africa to South Africa.

It can be found across the Indian and Pacific Oceans to Fiji, Tonga, or Samoa. It also extends northward into southern Japan before it finally ends its journey south in Australia!

Christmas Island and several other smaller islands on Indonesia’s coast as well as on Cocos (Keeling) Islands, Lord Howe Island near Australia’s eastern shoreline, and Tasmania all are places where you can see the koran angels!

Koran Angelfish Behavior

This bottom-dwelling invertebrate can be found in subtropical and tropical waters between 1 to 40 meters deep on sheltered coral reefs where it feeds off marine algae or tunicates that live inside sponges.

It can be found alone or in pairs with other fish such as groupers and snappers.

What Are the Features of  Koran Angelfish?

Pomacanthus halfcircled angelfish may be one of the most confusing species in this genus. There is an adult form that looks nothing like its juvenile counterpart, which can cause some consternation for researchers when looking at these pets.

1. Appearance & Colors


The hue of an adult’s body is plain yellow green and bleeds from bright to dark as it moves from front to rear along the body.

The lighter sections are speckled blue, and the darker areas are speckled with yellow. The gill margins and eye rings are sapphire blue, the head is plain yellow green, and the fins are likewise highlighted In speckled blue.


The juveniles of this species are blue-black marked from top to bottom with narrow white and blue stripes that become increasingly curved as they approach the base of their tail.

It’s rather easy for an observer to spot these distinctions because, at first glance, there is no other fish in our pond who looks anything like it!

The juveniles of the Pomacanthus semicirculatus adopt an adult coloration when they are 8 to 16 centimeters in size.

Koran Angelfish
Koran Angelfish

2. Fins

Pomacanthus semicirculatus is a deep-water fish with 13 spines and 20-23 soft rays in its dorsal fin. The anal fins contain 3 spines but 18 to 22 soft rays, making it look impressive 

3. Length

This beautiful fish has a maximum total length of 40 centimeters or 16 inch

Is Koran Angelfish Hardy?

The Koran Angelfish is a fish that can be difficult to care for because of its size, need for good quality water, and large tank size. It becomes easier in tanks larger than 250 gallons with moderate adult maintenance tasks.

It’s also important to mention that if there’s foot traffic around the aquarium this will stress them which could lead to illness or lack-of appetite among other things.

Koran Angelfish Availability

The Koran Angelfish can be found in stores and online. It’s fairly common for them to cost between $60-$150 depending on the size.

Note: Juvenile individuals are significantly simpler to come across in the aquarium trade than adult specimens.

Tiny: up to 1.5″$59.99
Small: over 1.5-2″$69.99
Medium: over 2-3″$89.99
Large: over 3-4.5″$149.99
Koran Angelfish cost table

How to Care for Koran Angelfish?

Water Quality

When it comes to water quality, koran angelfish are one of the most sensitive fish. 

This is because they require specific temperatures and more strict pH levels than some other types of aquarium inhabitants, making them difficult for beginners or those with less experience keeping anemones in their tanks.

1. Water Change

In general, it’s best to maintain 30% monthly changes (or 15%) every week if you plan on keeping them healthy.

Note: Keep track of your water testing to determine when your tank requires a water change.

2. Water Temperature

The ideal water temperature is roughly 72-82°F, which is a suitable range for your koran angel to be comfortable and active in.

3. PH Level

pH Level should range between 8- 8.4.

How to Care for an Angelfish: 11 Steps (with Pictures) - wikiHow
Angelfish water quality by WikiHow

2. Tank Requirements

1. Size

This fish has a large size (about 16 Inches), also it produces a lot of waste, so a large tank is a must to keep it unstressed and healthy.

If you want to keep them happy, we recommend housing them in a 250 gallons tank.

2. Decoration

You should decorate your tank with rocks or stony and soft corals arranged in a way that provides plenty of hiding places.

It is also important for the tank to have open areas where they can swim freely and explore their environment without feeling confined by boundaries, as this fish likes its space!

650 LITER ANGELFISH AQUASCAPE - 4K CINEMATIC - GREEN AQUA - YouTube |  Aquascape, Aquascape design, Angel fish
Koran Angelfish tank decoration by pinterest

Koran Angelfish Compatibility

The Koran Angelfish is a highly territorial species that can’t tolerate other koran angelfish. These species can be aggressive towards smaller fish like gobies, clownfishes, or blennies if they are introduced to the tank too late in their life cycle. 

If you still want to try keeping several of them together make sure they have a really large aquarium with plenty of room for all those beautiful angelfish!

Koran Angelfish Diet

The Koran Angelfish is a curious omnivore that thrives on all sorts of nutritious food sources in the wild.

In its natural habitat, it feeds primarily off sponges and marine algae but will also eat tunicates or other small animals living among them as well as stony and soft corals, worms, crustaceans or mollusks when available.

Young fish mainly feed themselves with lighter items made up of marine algae until they grow larger enough to hunt down heavier meals!

As we’re all aware, feeding your koran angelfish will help to ensure that they remain healthy and happy.

The best way to do this is by providing them with a varied diet consisting of large chunks, such as krill or raw shrimp.

It’s also important to supplement the meaty foods every so often to maintain their coloration patterns after the breeding season has passed.

You can do this by adding some type of herbivore option like spirulina on occasion alongside any other fish foods that suit them well.

 Koran Angelfish Gender Difference

Females often have a swollen belly when they’re fertile, but males are larger and paler than females.

Males also tend to be more pointed with their dorsal fins sticking out higher on top of their bodies as well as having longer anal fins too!

Here is a youtube guide on how to care for your koran angelfish.

Is Koran Angelfish Reef Safe?

Koran angelfish is a risky fish for your reef aquarium. It can feed on marine algae and small invertebrates that live in the vegetation, it also nips at stony or soft coral colonies toads.

What do I need to set up a marine aquarium? - Help Guides
Reef tank by swelluk

Last Words

Koran angelfish is a truly beautiful marine fish that’s worth keeping when you have all of the right resources with saltwater expertise!

We hope you have enjoyed this article as much as we did. If you still have any questions please share them with us in the comment section below.