Koran Angelfish Species Profile – How to Care Koran Angelfish

The Koran angelfish (Pomacanthus semicirculatus) is a stunning, deep blue and yellow fish. It hails from the western Indian Ocean and the Red Sea and grows up to around 15 inches (38 centimeters). It can be found in three general color morphs: golden top, white fin, and black fin. In addition to its bright colors, this species has a very unique pattern above it’s eyes that looks like a “mustache.” The dusting of metallic blue spots on its head also resembles an ascot or scarf. Its dorsal fins have small yellow stripes going through them – which may help distinguish it from other Pomacanthus species such as the French angelfish. This beautiful fish belongs to the Pomacanthidae family.

Koran Angelfish Characteristics:

Koran Angelfish Species Profile – How to Care Koran Angelfish

Koran angelfish have a very deep and stocky body. Males and females can be distinguished by the male’s pointed dorsal fin, as well as the faint yellow line that runs from his nose to the end of his tail (females lack this). Most specimens also have golden flecks or dustings across their bodies; these are especially apparent on the fins.

Koran Angelfish Origin:

The koran angel is native to western Indian Ocean and Red Sea near Somalia and Maldives . It’s also been reported occasionally in Japan. The species inhabits shallow lagoons, reefs, and seaward coral-rich areas at depths of between 22 to 150 feet (8–50 m). When night falls they will rise to the surface waters to feed.

Koran Angelfish Size:

Koran angelfish can grow up to 14 inches (35 cm) in length and weigh up to 3 pounds (1.5 kg). It has a very large mouth, even for its size! They are usually about 10–13 inches long when purchased, but they will continue growing during their lifetime.

Koran Angelfish PH:

In their natural environment, koran angelfish prefer a pH of 8.0-8.4, specific gravity 1.020 – 1.025 and a water temperature of 74-78 F (23-25 C). In an aquarium setting you should mimic these conditions as closely as possible – slightly alkaline, slightly brackish water. It’s important to monitor the specific gravity and pH of your koran angelfish tank even if you’re using an RO/DI system. Many hobbyists will use crushed coral in their filter or substrate to tweak these parameters towards what they desire – just be careful not to go overboard!

Koran Angelfish Colors and Markings:

The dorsal fin of the male is more pointed than that of his female counterpart. When present, the yellow line on his head mimics a mustache; this may help distinguish him from French angelfish specimens (Pomacanthus paru). Both sexes have metallic blue spots above their eyes (think “tattoos”) one of the most distinguishing characteristics of this species.

Koran Angelfish Aquarium:

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The Koran angelfish needs a minimum of 55 gallons (209 L) to school in, with 75 gallons (283 L) being optimal. They should be housed in groups of 10 or more because they are semi-aggressive and can harass weaker individuals within the group. They will spend most of their time at the top of the tank near the surface during daylight hours, so it’s important that your tank is tall enough if you want to keep them together with other deep water dwellers – eels, tangs, basslets, etc.

Koran angelfish need plenty of rockwork to hide among during the day; lots of nooks and crannies! They are nocturnal, so if you have a light on your tank during the night they will appreciate the cover.

Koran Angelfish Tankmates:

Koran angelfish can be semi-aggressive towards their own kind and other species with comparable body shapes – e.g., French angel fish, Fairy basslets (Pseudanthias tuka), etc. They can also harass slower or more passive fish, such as some wrasses and blennies. To prevent this from happening, it’s important to not overcrowd your aquarium, as well as provide lots of rockwork for them to hide in during the day time hours as mentioned above. In addition to these precautions you should try to keep koran angelfish with other koran angelfish.

Koran Angelfish Care:

Koran Angelfish Species Profile – How to Care Koran Angelfish

Feed your Koran angelfish a mainly herbivorous diet to keep them – and the aquarium – healthy. Lots of fresh vegetables, sinking algae wafers/pellets, frozen preparations including brine shrimp, mysis shrimp, etc., live rock rubble (i.e., “home made plankton”), chopped clams or mussels are all good choices for your Koran angelfish’s staple diet. You may also include some meaty foods such as squid or krill now and then to ensure they get their fair share of protein too! Be sure to provide plenty of calcium in their diet through cuttlebone, crushed coral skeletons or the like; otherwise their bones may become soft and deformed.

As far as feeding time goes, your Koran angelfish prefer to eat at night; they will come up to the water’s surface and graze like cattle on the algae that accumulates there! You should feed them no more than they can eat in about 5 minutes or so (2-3 times a week) because overfeeding wastes valuable nutrients and pollutes the water.

Koran Angelfish Lifespan:

The average life span of koran angelfish is 10–15 years, though some have been known to live as long as 20 years! They should be given a varied diet with lots of calcium to help ensure they stay healthy and strong throughout their lifetime.

Koran Angelfish Diet and Feeding:

Koran angelfish are primarily herbivorous, though not to the extent of other angelfish species such as the snowflake (Pomacanthus magnificus) and French angel fish (Pomacanthus paru). They will eat algae off of rocks if they can get to it, but supplemental feeding with sinking algae wafers or pellets is recommended at least once a day. If you don’t want them nipping at your corals, opt for sinking sticks which release less particles into the water column; this will reduce accumulation on viewing ports and intakes.

They also enjoy consuming copepods if present in your tank. If your Koran angel’s coloration is getting muted it might be time to feed them some meaty foods; they especially enjoy krill, squid and other marine flesh.

Koran Angelfish Differences:

The Koran angelfish is one of several species of angelfish which are all classified under the genus “Pomacanthus.” Other Pomacanthus species include the African pygmy angel, zebra longfin (Pomacanthus Maculosus), maroon (Pomacanthus semicirculatus) and queen (Holocanthus ciliaris) angels – among many others! The Koran angel can be distinguished from these other species by its white spots on the dorsal fin, body coloration and orange caudal fins.

Koran Angelfish Breeding:

Most Pomacanthus species are protogynous hermaphrodites; this means that they start life as one sex (female) and at some point during its lifespan changes sex to male. They can’t breed until female hormones take over, which usually happens sometime after the fish turns 6 years old. The trigger for this switch in sex is unknown – whether it’s physiological or environmental is still up for debate! Pairing occurs by matching the largest females with the largest males (of comparable coloration). However, an overly large female may be less likely to change sexes; if she does though, she’ll outgrow the male in short order! Females of these angelfish also have a tendency to become aggressive towards males after they have changed sexes.


The Koran angelfish is an overall beautiful fish which should be considered by most aquarists. They can be somewhat difficult to care for – they are not the hardiest of species and require ample calcium, low nitrates and stable water conditions to thrive. If you think this species might be right for your next addition, give them a shot! Be mindful that they can get fairly large (almost 12″) so this isn’t the best choice for smaller aquariums.