The Fish Guru

Exploring the Beauty and Temperament of Koi Betta Fish

Koi Betta is a beautiful fish breed that is rapidly gaining popularity among aquarium enthusiasts. These fish are known for their unique and distinct coloring patterns that resemble the iconic Koi fish.

In this article, we will explore everything you need to know about Koi Betta fish, including their history, traits, and differences from other Betta fish. What is a Koi Betta Fish?

Koi Betta fish are a variation of the marble bettas. As the name implies, these fish exhibit beautiful and intricate markings that resemble those seen on a Koi fish.

Unlike typical marble bettas, Koi Betta fish come in a range of colors that include red, orange, yellow, and white, and are often characterized by a black outline.

The History of Marbling Gene in Bettas

The marbling gene responsible for the unique and fascinating color patterns observed in Koi Betta fish has been a topic of much discussion among Betta fish enthusiasts. This marbling gene was first discovered by Orville Gulley in the early 1950s and was later developed into a line of Koi Bettas by Walt Maurus.

Over the years, breeders have been experimenting with this gene by crossing different betta types to create stunning new breeds like the Koi Betta.

Differences Between Koi and Marble Bettas

While Koi Bettas are a type of marble betta, there are distinct differences between the two that set them apart. For instance, marble bettas exhibit horizontal and vertical marble-like lines, whereas Koi bettas display intricate, eye-catching markings that resemble those found on Koi fish.

Another difference between these two types of Bettas is their coloration. Marble bettas come in a range of colors that include white, black, orange, and blue, whereas Koi bettas exhibit a range of distinct colors that are often characterized by a prominent black outline.

Koi Bettas are also larger than marble bettas, growing up to 3 inches in length, while marble bettas typically reach lengths of 2 inches.

Traits of Koi Betta Fish

In addition to their stunning appearance, Koi Betta fish exhibit several other traits that make them popular among aquarium enthusiasts. For instance, these fish are known for their robust personalities, making them an entertaining addition to any aquarium.

Another trait that sets Koi Bettas apart is their ability to change color depending on their mood or environment. When stressed, Koi Bettas tend to display darker, more intense colors, while relaxed Koi Bettas often appear paler.

Koi Bettas are also easy to care for and do well in a range of temperatures. However, like all Betta fish, Koi Bettas require regular water changes and a well-maintained aquarium to thrive.


Koi Betta fish are a stunning and unique addition to any aquarium. Their distinct coloring patterns and robust personalities make them a favorite among aquarium enthusiasts worldwide.

While they may require some care and attention, the effort is well worth it for the beauty and entertainment Koi Bettas bring to any aquarium.

3) Galaxy Koi Betta Fish

Galaxy Koi Bettas are a stunning variation of the Koi Betta fish, known for their iridescent scaling and unique coloration patterns. These fish have a base body color that ranges from white to light pink, with small spots of intense color scattered throughout their bodies.

The most striking feature of these fish is their iridescent scaling, which creates the impression of a starry galaxy covering their entire body. This pattern is created by breeding regular Koi Bettas with metallic Bettas and is highly sought after by aquarium enthusiasts.

Male and female Galaxy Koi Bettas also exhibit differences in coloration patterns. Male Galaxy Koi Bettas have a darker base color than females and tend to have more iridescent scales.

Additionally, their fins and tails may display a range of colors that complement their body coloring and iridescent scaling. On the other hand, female Galaxy Koi Bettas have a lighter base body color with fewer iridescent scales and also display a less complex coloring pattern.

To care for your Galaxy Koi Betta, provide them with plenty of hiding spaces such as live or artificial plants, but ensure the aquarium has ample swimming space. Moderate to high lighting in your aquarium helps to bring out the beautiful iridescent colors of your fish.

They also enjoy a range of live, frozen, and freeze-dried foods and should be fed several small meals per day.

4) Koi Plakat Betta Fish

Koi Plakat Bettas are a shorter-finned variation of the Koi Betta. These fish exhibit shorter, more tapered fins, which give them a more streamlined appearance and make them faster swimmers.

These Bettas come in a range of color combinations that include black, orange, white, and blue, with distinct patterns similar to those of a classic Koi fish. These Bettas are highly valued among aquarium enthusiasts for their unique coloring and streamlined appearance.

Compared to other plakat variations, Koi Plakat Bettas tend to have shorter fins and tails. They are also smaller in size, reaching up to 2.5 inches in length.

Their smaller size, however, does not make them any less impressive or beautiful. Koi Plakat Bettas are a great addition to any aquarium seeking a unique and striking fish.

When taking care of Koi Plakat Bettas, it’s essential to provide them with space to swim, distinctive hiding spots such as caves and rocks. They also enjoy a range of live and dry food and should be fed several small meals a day.

It’s advisable to keep the water temperature between 75 and 82 degrees and perform regular water changes. In conclusion, both Galaxy Koi Bettas and Koi Plakat Bettas are captivating variations of Koi Bettas that are sure to add a unique and striking touch to any aquarium.

They are easy to care for and exhibit remarkable coloration and patterns that make them a favorite among aquarium enthusiasts. By providing your fish with a properly maintained aquarium and high-quality food, you can ensure they maintain their striking appearances and thrive in their environment.

5) Male and Female Koi Betta Fish

Male and female Koi Betta fish display differences in both physical appearance and behavior. A significant difference between male and female Koi Bettas is their coloring displays.

Male Koi Bettas often exhibit brighter and more vibrant coloration than females, which is usually seen more in their tails and fins. They also have a more streamlined body shape and display longer ventral fins than their female counterparts.

Female Koi Bettas, on the other hand, have a more rounded body shape and exhibit less vibrant coloring than male Koi Bettas. They also have a shorter ventral fin than males.

An eggspot on the female’s underside, referred to as an ovipositor, also serves as a clear indication of the sex of the Koi Betta. Identifying the sex of a Koi Betta fish is essential, particularly when breeding.

To identify the sex of Koi Bettas, observe the fish’s physical characteristics carefully. Males tend to exhibit brighter coloration and longer fins, while females have more subdued coloring.

The ovipositor on the female’s underside is another clear indication of the sex of the fish.

6) Koi Betta Fish Care

To keep Koi Betta fish healthy and happy, ensuring the proper care for their environment and diet is crucial. The following are vital tank requirements to consider when caring for Koi Bettas:

Tank Requirements: The pH level for the water in your tank should be between 6.5 and 7.5, with a water hardness level of up to 10 dGH.

An aquarium with a capacity of at least five gallons should be used. Ensure the water temperature is maintained between 75 to 82 degrees Fahrenheit.

Plenty of live or artificial plants should be present, and moderate water currents should be maintained. What Koi Bettas Eat: A mixture of frozen, live, and pellet food should be provided to ensure a balanced diet.

Feed your Bettas several small meals throughout the day to prevent overeating. Breeding Koi Betta Fish: Breeding Koi Bettas requires careful attention to ensure a healthy process.

A breeding pair should first be selected, with one male and one female. The breeding tank should possess a good filtration system, live plants, and proper water conditions to encourage the breeding process.

The mating process usually begins with a particular dance by the male, and fertilization occurs as the female drops her eggs. The eggs will hatch in two to three days.


Koi Betta fish can make for incredible additions to any aquarium due to their striking appearance and behaviors. Male and female Koi Bettas display notable differences in physical appearance and behavior that should be observed.

When caring for Koi Bettas, ensuring proper tank requirements and providing a balanced diet is essential. Finally, breeding Koi Bettas requires special attention to maintain good health in both the fish and their offspring.

By providing the perfect environment and care for Koi Bettas, you can help maintain their striking appearance and see them thrive in their aquarium.

7) Koi Betta Fish Temperament

Betta fish are known for their unique temperaments, and Koi Betta fish are no exception. These fish tend to be more aggressive than some other fish species and may display territorial behavior, especially when housed in smaller aquariums.

Koi Bettas have been known to flare their fins and tails aggressively towards other fish, particularly when introduced into a new environment. However, with proper care and attention, they can cohabitate peacefully with other species.

When it comes to choosing tank mates for Koi Betta fish, it’s essential to consider their unique temperaments. Choosing tank mates that are peaceful, tropical, or schooling fish is often the best option.

Some ideal tank mates for Koi Bettas include Neon Tetras, Corydoras Catfish, and Otocinclus Catfish. However, it’s essential to ensure that other fish species do not display fin nipping behaviors as this can lead to stress and disease among Bettas.

Sorority Tank Set Up for Koi Bettas

Creating a sorority tank for female Koi Betta fish can be an incredible experience. It is essential to provide ample aquarium space and adequate tank decorations to create territories.

Providing a hierarchy in the tank helps to maintain peace and avoid aggression. To set up a sorority tank for Koi Betta fish, it’s necessary to provide a large aquarium with ample space.

Providing hiding spaces such as plants, caves, and other tank decorations is also important. It’s essential to provide individual territory to each female fish by dividing the aquarium into several sections with walls or decor.

The size of the aquarium should enable you to introduce at least four female Koi Betta fish. Ensure that they have space to swim and explore to create trust and reduce aggression among them.

Regular water changes and proper filtration should be maintained to avoid stress and disease among your Koi Betta fish. 8) Where Can I Buy Koi Betta Fish?

Koi Betta fish have become a popular addition to aquariums worldwide, and they are available for purchase in online and local aquarium stores. Online breeders, particularly in southeast Asia, produce a large number of Koi Bettas.

Breeders usually have more varieties and more unique patterns than fish in stores but can be more expensive. Several local aquarium stores also specialize in Bettas.

These stores offer a range of healthy and beautiful Koi Bettas at different prices. While you may not have as many options as those provided by online breeders, buying from a store ensures that you can examine your fish before purchasing.

Some essential considerations when purchasing Koi Bettas include the fish’s genetic background, coloring, pattern, and overall health. Observe the fish’s behavior and physical characteristics before purchasing, and do some research on the breeder before making a purchase.

A healthy Koi Betta fish will exhibit bright and vibrant colors and active behavior.


Koi Betta fish are an incredible and beautiful addition to any aquarium. Their unique temperaments, stunning coloration, and behavior make them an excellent species to care for.

When choosing tank mates for Koi Bettas, consider peaceful or schooling fish to minimize aggression, as well as providing enough space to create territories. When purchasing Koi Bettas, consider factors such as the fish’s genetic background, coloring, pattern, and overall health.

By providing care and attention to your Koi Bettas, you can help them thrive in their environment. Koi Bettas are a captivating fish breed that has gained popularity among aquarium enthusiasts worldwide for their stunning appearance and unique behavior.

This article covered several aspects of Koi Bettas, including their traits, differences between male and female variants, care requirements, tank mates, sorority tank setup, and where you can purchase them. When caring for Koi Bettas, it’s essential to ensure their tank environment is well-maintained, provide a balanced diet, and be careful when introducing them to new tank mates.

By providing proper care and attention, Koi Bettas can continue to thrive and exhibit their beautiful coloring and distinct personality.

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