Koi Angelfish

The Koi Angelfish is a beautiful fish with bright colors that is popular in both fresh and saltwater aquariums.

As a result of this popularity, many cross-breedings occurred, resulting in all kinds of variations available today on your local fish store shelves!

In this article, we’ll explore everything you need to know about Koi Angelfish care, including diet, tank setup, and more!


Scientific NamePterophyllum
OriginNorthern South America
AggressionGenerally peaceful, but can be territorial during spawning.
Minimum Tank Size40 gallons for a pair, but a larger tank is required for a group
Length6 inches (15 cm) long, 8 inches (20 cm) tall
Ease of CareModerately hardy
pH6.0 – 7.4
Temperature76° – 86° F (24° – 30° C)

Koi Angelfish Origins & Habitat

The Koi Angelfish is a member of the Pterophyllum scalare species. It’s a non-aggressive shoaling cichlids that may be found in the Amazon River and its tributaries in Brazil, Peru, and Rio Negro.

These species prefer fast-flowing water with nutrient-rich substrates near rocks or fallen trees.

Koi Angelfish Lifespan & Life Cycle


Koi angels have a lifespan of more than ten years, which is considerably longer than other tropical community fish species. This makes them an excellent choice for long-term aquariums.

Life Cycle

First, your Scalare must become at least 5 cm/2 inches before they are mature. If kept on a suitable diet and with patience, koi angelfish will reach maturity within 8-12 months.

When your angels are in perfect condition, and water parameters suit them well, they will lay their eggs on almost any flat vertical surface like Amazon Swords or a piece of slate.

You’ll know if the eggs are fertilized or not because after 24 hours they will start turning white. 

Unfertilized eggs will be attacked by fungus and become very fuzzy after 48 hours if they have not been consumed by other aquarium occupants.

Fertilized eggs, on the other hand, will start showing wiggling fry tails 48 hours after being placed.

The parents will start to move the small fry around on day three, and you can see their yolk sacks bulging with an egg. 

On day four, you will start to notice tiny eyes on the fry and by the fifth day, they are starting to shrink. 

Very soon after that, the fry fish will swim freely in its little ecosystem without any supervision or caretaking from an adult nearby!

After about seven days, the fry starts getting hungry and will be very desperate for food.

What Are the Features of Koi Angelfish?


Koi Angelfish are diamond-shaped fish with a compressed body shape. It has round triangular dorsal and anal fins, as well as round triangular pectoral fins.

The dorsals are situated on its body for support when swimming through water at different speeds.


As mentioned above, many cross-breedings have occurred, resulting in a wide variety of color variations.

1. Red Koi Angelfish

The red koi angels are a crossbreed of blushing angelfishes and common Koi. The majority have red scales on their bodies, although certain varieties have black or yellow designs to set them apart from the others in the tank!

2. Ghost Koi Angelfish

The Ghost Koi Angelfish is a beautiful fish with an elegant form. The males are entirely colorless, with the exception of a gold-yellow patch on top of their heads that gives them a distinctive gleam among all other species.

3. Blushing Koi Angelfish

Blushing Kois have a red hue that causes them to blush. The gold-orange patch on the head area of these fish, which resembles tears, gives them their name “Blush.”

Besides, they have golden bodies and silver heads with gold-orange highlights in their dorsal fins.

4. Red Devil Koi Angelfish

Red Devil Koi Angels are a crossbreed of a common angel and red koi devil or super-red variety. This fish has yellow coloration patches on its head.

5. Blue Koi Angelfish

Blue koi angels’ body color ranges from light blue to black coloration, with several white colorations or yellow scales on their head area that gives them an appearance similar to glittering pearls in shallow water.

They also have dark patches on each side which create shadows when not lit up by the lights above.

6. Orange Koi Angelfish

Orange koi angel has light orange scales on their body and heads that become dark golden as it approaches your touch, making them very attractive to look at up in a pond.

7. Albino Koi Angelfish

The Albino Koi Angel is a unique variety with red or pinkish eyes and yellow markings on the head. 

They’re known as albinos because their bodies lack pigment – this makes them appear white when exposed to light (which would otherwise turn an object into its color)

8. Super Red Koi Angelfish

Super red koi angels have scales that cover their bodies with super red colors, as well as gold spots on the top of their heads that you can see clearly in good lighting conditions.

Weight & Length

The average weight of a Koi Angel is 1/2 to 3/4 pounds (0.1 to 0.3 kg). When they are adults they have an average length of 6 inches (15 cm) long and 8 inches (20 cm) tall.

Keep in mind that the size and weight of your angelfish may vary considerably based on genetics and growing conditions.

Is Koi Angelfish Hardy?

Although they are not as hardy as most angelfish breeds, they are relatively simple to maintain. Thus, they’re an excellent choice for novices in the aquarium business.

Koi Angelfish Availability

They’re not as well-known as other breeds, but they’re widely available in most koi fish stores.

Their colors are extremely distinctive, which has made them a popular choice among hobbyists wanting to add beauty to their ponds or aquariums.

They are reasonably priced when it comes to cost. Small fish, such as those between the sizes of 1 and 2 inches, may be purchased for around $12 at the market. However, the price varies depending on the size, quality, and season of the year.

How to Care for Koi Angelfish?

Tank Size

Koi angels require a tank size of at least 40 gallons to survive. If you’re planning on keeping more than one fish, you’ll need to increase the size of your community aquarium accordingly.

pH Level

Koi angelfish prefer slightly alkaline water. The ideal pH range for koi angelfish is between 6.0 and 7.4 degrees.

You can use blackwater extract to replicate their native fermenting ponds without affecting the pH of the water. Also, you should test pH levels regularly using a reliable test kit to ensure optimal conditions for your fish.


The natural light allows the Koi to approach closer to their natural photoperiod. This is because it provides a more realistic representation of what their natural habitat would be like.

This makes them feel at ease and safe, as well as assists with health problems like lean growth hormone production and female fertility cycle synchronization.

The diurnal cycle of a koi is best suited to 8 hours. If they’re in peak light and you have natural sunshine as well as your artificial lighting system (or just lights), give them about 8-12 hours of darkness.


Koi angelfish come from tropical climates and prefer warm water. The ideal temperature range for koi angelfish is between 76 and 86 degrees Fahrenheit (24 to 30 degrees Celsius).

You can use an aquarium heater to maintain the correct water temperature for your fish. It’s also a good idea to have a thermometer in your tank so that you can monitor the water temperature on a regular basis.


Koi angelfish are sensitive to water quality parameters, and proper filtration with slow-moving waters is required to keep them safe from pollutants like nitrates.

For these reasons we recommend using Bio-Wheel filters because they don’t create too much turbulent noise.

Tank Decoration

Koi Angels prefer to have 2-3 big flat rocks for swimming in between while also including numerous tiny pebbles along the bottom.

They also like having at least three or more flat stones for laying on, and two fallen tree branches to rest near.

Small plants, mosses, and driftwood may also be used as decorations. However, they can be utilized to make hiding spots for your angels, ensuring it feels at ease living in an aquarium with other species of fish.

Koi Angelfish Diet

Koi angels are omnivores that will eat anything given to them, whether it’s live, frozen foods, or cooked foods — blood worms or tubifex worms al dente with some cracked wheat work well.

If you want to keep your koi orange coloration, provide them with foods that include carotenoids. Most angelfish food on the market today includes lots of these chemicals and will give your fish what they need for coloration.

When it comes to feeding frequency, you should feed your fish twice a day the quantity of food that they will consume within 5 minutes.

When you keep your koi angels in a community aquarium you may need to increase their meals to three times daily to ensure that they receive all of their nutrients and remain healthy.

Koi Angelfish Compatibility

Koi angelfish good tank matesKoi angelfish bad tank mates
Ram fishLoach
SwordtailsPike fish
Neon tetraSome large fish species such as the Giant Gourami and Nandus.
PlecoBig Eels that can fit into their cave or hideaways within a tank
CatfishBigger amphibious monsters might eat them while hiding in plants, especially if they become larger than the Koi-Angel soon.
Bala shark
Medium-sized fish

Remember that during spawning times, the community tank will become more territorial and require a lot of room to reduce aggression.

Is Koi Angelfish Reef Safe?

Koi Angelfish are safe for reefs, provided they aren’t kept in an aquarium with coral or invertebrates.

They may try to consume corals and other live invertebrates, but they are not known to target hard corals in an aquarium.

Koi Angelfish Gender Difference

You can distinguish between males and females while they’re breeding. During this time, males have pointed genital papillae, whereas females are blunt (or blunter).

Also, you can differentiate between them as the fish that will lay the eggs (females) tend to be larger than the male fish.

Last Words

Koi AngelfishKoi angels are beautiful and unique fish that make a great addition to any aquarium. They are relatively easy to care for, but it’s important to understand their needs before adding them to your tank.

Provide them with plenty of space, hiding places, and the right water parameters, and they will thrive in your aquarium.

We hope you enjoyed this article. If you have any questions or comments, please leave them below.

Happy fish keeping!