Galaxy Koi Betta Fish Setup and Care Guide

galaxy koi betta
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Last Updated: July 18, 2023 by Flora Gibbins

In my years as an aquarist, I’ve had the privilege of caring for different Betta types, each stunning and unique in its own right. But there’s something magical about the Galaxy Koi Betta fish that sets it apart. Picture the universe’s ethereal beauty confined to your living room, casting a spell with each mesmerizing swirl of its iridescent blues, fiery reds, and radiant yellows. The spectacle is simply breathtaking.

Also known as the Siamese Fighting Fish, the Galaxy Koi Betta is a master of disguise, but it’s not just their entrancing colors that fascinate me. Each fish comes with its unique patterns and colorations, like an artist’s masterpiece, giving you the feeling of owning a tiny fragment of the cosmos itself.

But there’s more that differentiates the Galaxy Koi Betta from its Betta brethren. What truly sets them apart is their “koi” trait, which refers to their remarkable ability to change colors throughout their lifetime. This chameleon-like trait, a phenomenon known as “marbling”, is the result of a particular gene. The unpredictable and dynamic nature of this marbling process means your Galaxy Koi Betta fish can surprise you with new, stunning color variations at any time.

Over the years, Galaxy Koi Betta fish have become more than just pets for me; they’re a testament to nature’s infinite creativity and a daily source of joy and inspiration. I invite you to join me as I delve deeper into the captivating world of these celestial creatures, exploring their needs, characteristics, and how you can add a piece of the galaxy to your aquatic family.

Galaxy Koi Betta Facts and Overview

  • Common Names: Galaxy Koi Betta, Siamese Fighting Fish
  • Scientific Name: Shining Betta
  • Adult Size: 2.5 to 3 inches
  • Lifespan: 3 to 5 years
  • Colors & Markings: Blues, reds, yellows, whites; marbling
  • Fins: Variety from deltas to veiltails
  • Origin: Selective breeding, Thai/Malay/Cambodian lineage
  • Minimum Tank Size: 5 gallons
  • Diet: Carnivorous; Betta pellets, brine shrimp, daphnia, bloodworms
  • Water Temp: 76 to 82 degrees Fahrenheit
  • Galaxy Koi Betta Types: Nemo, Fancy, Yellow, Orange Koi Bettas

Origin and Distribution

As an experienced Betta caretaker, one of the most intriguing aspects of Galaxy Koi Betta fish for me is their rich history and diverse origins. The Betta species, in general, hails from the warm, shallow waters of Thailand, Malaysia, and Cambodia. This Southeast Asian heritage is characterized by their adaptability to survive in less-than-ideal environments, including stagnant ponds and rice paddy fields, thanks to their labyrinth organ allowing them to breathe atmospheric air.

However, the celestial charm of the Galaxy Koi Betta is a testament to the magic of selective breeding. Through careful, patient cultivation, breeders have succeeded in combining the hardy nature of the Betta splendens with the color-changing “koi” trait, resulting in our enchanting Galaxy Koi variant.

While the term “koi” typically brings to mind the well-loved ornamental carp from Japan, in the context of Betta fish, it refers to their marbling trait, which allows them to change colors throughout their lifespan. Hence, These Bettas offer a captivating dance of colors, reminiscent of the shifting hues of celestial galaxies.

Today, thanks to their captivating beauty and unique traits, Galaxy Koi Betta fish have spread far beyond their original Southeast Asian habitats, finding loving homes in aquariums worldwide. Their striking appearance, combined with their resilience and intriguing behavior, has earned them a cherished place in the hearts of aquarists like you and me. As we explore further, you’ll discover why these aquatic wonders make such fascinating and rewarding pets.


In the realm of Bettas, Galaxy Koi Bettas stand out like celestial bodies in the night sky. Their unique coloration and patterns set them apart from other Betta types. While most Bettas are admired for their solid or bicolor splendor, the Galaxy Koi type are an artist’s canvas brought to life, their bodies and fins displaying a stunning mix of iridescent colors reminiscent of distant galaxies.

Galaxy Koi Betta vs Koi Betta

The term “Koi Betta” generally refers to a multi-colored Betta fish that has a color pattern similar to that of a Koi fish, typically a combination of red, black, and white colors. What makes the “Galaxy Koi Betta” stand out from the general Koi Betta is their unique color pattern.

The “Galaxy” in Galaxy Koi Betta indicates an exceptionally vibrant and complex color palette that often includes an interplay of blue, red, white, orange, and black colors, arranged in a way that brings to mind images of swirling galaxies. This variant also often displays an iridescent, metallic sheen on their scales that gives the impression of twinkling stars in a night sky, further enhancing the “galactic” description.

Each Galaxy Koi Betta’s color pattern is unique, and their dazzling, cosmic-like appearances have made them highly sought after by Betta enthusiasts. There can be significant variation in each fish’s appearance, with some displaying more blue, others more orange, some with more marbling, and others with a more metallic sheen. It’s part of what makes them so intriguing!

koi betta fish
A typical Koi Betta fish

Galaxy Koi Betta Fish

Fin and Size Variations

While their coloration is undoubtedly their most distinctive feature, Galaxy Koi Bettas also impress with a variety of fin types. Depending on their genetics, they can sport anything from long, flowing veiltails to broader and more angular deltas. Their fins are often a canvas for colors as vibrant as those on their bodies, making them look like celestial bodies gliding through the water.

In size, Galaxy Koi Betta fish typically reach around 2.5 to 3 inches when fully grown, with male Galaxy Koi Betta usually being slightly larger than females. Despite their relatively small size, they pack an incredible visual punch, proving that, indeed, good things come in small packages.

Remember, however, that the beauty of these fish is not merely skin (or scale) deep. Their vibrant appearance is a gateway to understanding their fascinating behavior, natural compatibility, and specific care needs, which we’ll explore in the following sections. It’s this comprehensive knowledge that transforms an average aquarist into an exceptional caretaker, making the journey with these beautiful creatures even more rewarding.

Behavior and Temperament

One might say the Galaxy Koi Betta’s personality is as vibrant and multifaceted as its coloration. As a longtime caretaker of these celestial marvels, I’ve observed they are not just about outer beauty—their behavior and temperament are equally intriguing.

Galaxy Koi Betta fish, like all Bettas, are known for their intelligence and interactive behavior. They recognize their caregivers and often react to their presence, making them delightful companions. Their curiosity drives them to explore their surroundings, adding a dynamic element to your aquarium.

Yet, beneath their curious and interactive demeanor lies a feisty spirit. The term “Siamese Fighting Fish” wasn’t assigned arbitrarily — male Bettas are notoriously territorial and aggressive towards each other. This is particularly prominent during mating season or when space is limited. They display their aggression through a variety of behaviors, including flaring their gills and spreading their fins wide to make themselves appear larger and more intimidating.

While their aggression is usually directed towards other males of their kind, they can also display territorial behaviors towards other fish species, especially those with bright colors or long fins that resemble Betta characteristics. However, female Galaxy Koi Bettas tend to be more sociable and less territorial than their male counterparts.

This inherent territoriality doesn’t mean Galaxy Koi Betta fish must always live in solitude; they can coexist with other aquatic species under the right circumstances, which we’ll explore in a later section.

Galaxy Koi Betta Tank Mates

Given the spirited, somewhat feisty temperament of Bettas, choosing suitable tank mates for them can be a delicate task. Over the years, I’ve learned that this choice hinges on a careful understanding of their behavior as well as the habits of potential tank companions.

Compatible Fish Species

While the aggressive streak in Bettas often leans towards solitary housing, many peaceful, quick, and non-flashy fish can coexist with Galaxy Koi Betta fish without triggering their territorial instincts. Some examples include:

  • Corydoras Catfish
  • Ghost Shrimp
  • Neon Tetras and Ember Tetras
  • African Dwarf Frogs

These species are known to maintain their peace, avoid fin nipping, and aren’t likely to be perceived as threats by your Betta.

Non-Fish Tank Mates

There’s also the option of adding non-fish companions to your Galaxy Koi Betta’s abode. Snails, like the Nerite or Mystery snails, are ideal as they are peaceful, stay out of your Betta’s way, and help keep the tank clean.

Tank Mates to Avoid

There are, however, certain aquatic species that you should avoid pairing with your Galaxy Koi Betta fish. Other Betta fish, especially males, are a no-go due to the Betta’s territorial nature. Fish with long, flowing fins or vibrant colors that resemble Betta characteristics, such as guppies, might also trigger your Betta’s aggression.

It’s crucial to remember that each Betta fish is unique, and while these are general guidelines, your Galaxy Koi Betta’s individual temperament may vary. Always keep a close eye on your Betta when introducing new tank mates and be prepared to separate them if signs of stress or aggression appear.

Social Interaction: Isolation vs. Companionship in the tank

Galaxy Koi Bettas are intriguingly complex creatures. Despite their territorial and aggressive nature towards other Bettas, they can peacefully coexist with certain tank mates, provided those mates are non-aggressive and have similar water condition requirements.

Male Galaxy Koi Betta are best kept alone to avoid conflict and injury, while managing a group of female Bettas or a “sorority” can be challenging and is not recommended for beginners.

Even though Bettas are often seen as solitary, they interact and engage with their environment and their human caregivers. By offering an enriched environment and daily interaction, you can help ensure your Betta thrives.

Tips for Choosing Your Galaxy Koi Betta Fish

Selecting your Galaxy Koi Betta is a thrilling moment — it’s the beginning of a beautiful journey. But this decision involves more than just falling in love with a dazzling display of colors. Over the years, I’ve learned that the key to a rewarding Betta companionship lies in choosing a healthy fish and considering the ethical implications of your purchase.

What to Look for in a Healthy Galaxy Koi Betta Fish

galaxy koi betta against dark background

Here’s what you should be looking for to ensure you bring home a healthy Betta:

  • Active Behavior: Healthy Bettas are lively and curious. They should respond to your presence and display a keen interest in their surroundings.
  • Vibrant Colors and Clear Patterns: The Galaxy Koi Betta is admired for its vibrant, shifting colors. Their coloration should be vivid, and their patterns should be clear. A dull or fading color might indicate illness.
  • Healthy Fins: Check for any tears, holes, or fraying in their fins. While minor tears can heal, more severe damage or signs of fin rot can indicate health problems.
  • Clear Eyes and Gills: Their eyes should be bright and clear without any cloudiness. Similarly, their gills should be free of any discoloration or inflammation.
  • Smooth Scales: The scales should lay flat against the body. Raised scales can be a sign of a serious health condition known as dropsy.

Ethical Considerations When Buying a Betta Fish

Being a responsible aquarist means considering the ethical implications of buying a Betta fish. Unfortunately, Betta fish are often subjected to inadequate living conditions due to misconceptions about their housing needs.

When purchasing your Galaxy Koi Betta, consider buying from a reputable breeder or store that maintains their Bettas in appropriate, healthy environments. Avoid vendors who keep Bettas in tiny, unheated containers.

By making informed and ethical decisions when choosing your Galaxy Koi Betta, you’re not just ensuring a healthier and happier life for your new aquatic companion, but also promoting better practices within the pet trade industry.

Galaxy Koi Betta Fish Care

If I were to distill all my years of caring for Bettas into a single sentiment, it would be this: these magnificent creatures, while not overly demanding, require thoughtful, consistent care. The joy of watching them flourish in an environment you’ve tailored for their needs is beyond words. Let’s dive into the specifics of Galaxy Koi Betta care to ensure your aquatic companion thrives under your guardianship.

Tank Setup

Creating a haven for your Galaxy Koi Betta involves carefully setting up their tank. A well-arranged tank doesn’t just contribute to their health—it also becomes a delightful focal point in your living space. Here’s what you need to know:

Tank Size

While Bettas are often seen in tiny bowls in pet stores, it’s a common misconception that they thrive in such environments. For your Galaxy Koi Betta, a minimum of a 5-gallon tank is recommended. If you plan to have tank mates, aim for larger.

What to Put in the Tank

Your tank should mimic the natural habitat of Bettas to make them comfortable. Add live or silk plants for hiding spots and to break their line of sight—this helps in reducing stress.

Consider a gentle filter to keep the water clean without creating strong currents, as Bettas prefer calm waters. You’ll also need a heater to maintain the right temperature (more on that later).

Equipment and Accessories

Other than the filter and heater, consider a tank light to illuminate the brilliant colors of your Galaxy Koi Betta, and a lid to prevent any potential ‘jump-outs’. Also, a thermometer to monitor the water temperature, and a test kit to keep track of water parameters can be invaluable.

Water Parameters

For the well-being of your Galaxy Koi Betta, it’s essential to maintain certain water parameters consistently. These include:

  • Temperature: Maintain between 76-80 degrees Fahrenheit (24-27 degrees Celsius). A reliable aquarium heater is a must.
  • pH: Aim for slightly acidic to neutral conditions, a pH in the range of 6.5 to 7.5.
  • Ammonia and Nitrite: These should always be at 0 ppm (parts per million). Regular water changes and a good filter help control these levels.
  • Nitrate: Keep below 20 ppm, as higher levels can be harmful.
  • Hardness: Preferably soft to moderately hard water, with a general hardness (GH) of 3-7 and a carbonate hardness (KH) of 3-5.

Monitor these parameters weekly with a reliable test kit, making gradual adjustments as needed to avoid stressing your Betta. Remember, stability is key in creating a comfortable home for your Galaxy Koi Betta. Up next, we’ll discuss their dietary needs—an integral part of their care.

Diet and Feeding

Just like us humans, Bettas thrive on a varied and balanced diet. With their carnivorous instincts, feeding these magnificent creatures requires a little more than just dropping some flakes into the tank.

  • Types of Food: Bettas enjoy a mix of dry and live foods. High-quality Betta fish pellets or flakes serve as a good base, but supplementing this with live or frozen foods such as brine shrimp, daphnia, or bloodworms, offers them the variety and nutrition they need.
  • Feeding Frequency: I usually feed my Bettas once or twice a day, giving them only as much food as they can consume in about two minutes. Overfeeding can lead to health issues and can dirty the tank.
  • Considerations: Bettas have tiny stomachs, about the size of their eye, so they don’t need a lot of food at once. Also, Bettas are known to be quite the surface feeders, so food that stays at the top is generally best.

Common Health Issues and Diseases

As a seasoned Betta caretaker, one truth I’ve learned is that prevention is better than cure when it comes to fish health. Still, it’s important to know the common health problems that Galaxy Koi Bettas can face, so you can recognize symptoms early and take appropriate action.

  • Fin Rot: Characterized by fraying, torn, or discolored fins, fin rot is often a result of poor water conditions. Regular water changes can prevent it, while early-stage fin rot can often be reversed with cleaner water and over-the-counter medication.
  • Ich (White Spot Disease): If your Betta has white spots resembling grains of salt on its body, it might have Ich. This parasitic disease can be treated with increased temperature and medication.
  • Velvet Disease: This parasite causes a rusty, gold, or velvet-like appearance on your Betta’s body. It can be prevented with good water conditions and treated with medication.
  • Swim Bladder Disease: If your Betta struggles to swim properly, it might have a swim bladder issue, often caused by overfeeding or constipation. A fasting period and feeding a cooked, deshelled pea can often remedy this.
  • Dropsy: Swollen body and raised scales are signs of Dropsy—a serious bacterial infection. It’s often hard to cure and can be prevented with good water conditions.

Please remember that this list is not exhaustive, and if your Galaxy Koi Betta fish shows signs of illness that you can’t identify, it’s always best to consult a vet or a fish health expert. Up next, we’ll talk about the social interaction needs of your Galaxy Koi Betta — whether they prefer solitude or company in their celestial realm.

galaxy koi betta

Breeding Galaxy Koi Betta Fish

Breeding Bettas, including the enchanting Galaxy Koi variant, can be a fascinating experience. Yet, it’s a complex process requiring dedication, preparation, and care. Here’s a brief overview:

Gender Differences

Distinguishing male from female Galaxy Koi Betta fish is important. Males usually have longer fins and brighter colors, while females are smaller with shorter fins and a visible white egg spot between their ventral and anal fins.

The Breeding Process

Bettas engage in a unique mating ritual. After a courtship dance, the male Galaxy Koi Betta wraps around the female to fertilize the eggs she releases. The male then gathers the eggs into a “bubble nest” he’s built at the water’s surface, where he guards them until they hatch.

Breeding Tips

Before attempting breeding, prepare a separate breeding tank with warm, shallow water and lots of hiding spots. Feeding potential parents live food can help induce spawning. Remember, the process can be stressful for the fish — especially the female — and careful monitoring is needed to prevent injuries.

Remember, breeding Galaxy Koi Betta fish is not for the faint-hearted and requires a significant time and effort investment. Yet, watching your own baby Bettas grow can be a truly rewarding experience!


Why is my Galaxy Koi Betta losing color?

A Betta’s color can fade due to factors like diet, water conditions, age, or stress. Ensuring a clean environment and a nutritious, varied diet can help maintain their vibrant hues.

Can Galaxy Koi Betta fish live in bowls?

While Bettas can survive in small spaces, thanks to their labyrinth organ that lets them breathe air, they truly thrive in larger environments. I recommend a heated, filtered tank of at least 5 gallons.

How often should I clean my Betta’s tank?

The frequency depends on your tank’s size and if it’s filtered. For a filtered 5-gallon tank, a 25% water change weekly is a good practice.

Can I keep two Bettas together?

Keeping two Bettas together, especially males, is generally not advised as they can become aggressive and injure each other due to their territorial nature.

How can I enrich my Betta’s environment?

Additions like live plants, caves, and other decorations provide your Betta with hiding spots and areas for exploration. They also appreciate a gentle current and subdued lighting.

Are Galaxy Koi Bettas Right for You?

Deciding to welcome a Galaxy Koi Betta into your life isn’t a decision to take lightly. These enchanting creatures require dedicated care, the right environment, and a committed owner willing to meet their needs.

Galaxy Koi Betta fish are a great choice if you appreciate their stunning beauty and don’t mind putting in the effort to maintain the right tank conditions. They’re interactive, full of personality, and can bring a sense of tranquility to your space.

However, if you’re looking for a low-maintenance pet or if you lack the time and resources to invest in their care, a Betta, let alone a Galaxy Koi Betta, might not be the best choice.

But if you feel a tug at your heart when you look at the celestial beauty of a Galaxy Koi Betta and feel ready to take on the responsibilities, I encourage you to make the plunge. The bond you form and the joy you derive from watching them flourish in your care will be a reward in itself.

Remember, in the end, being a great pet owner—be it for a Betta or any other creature—is about providing a safe, loving, and nurturing environment for them to thrive in. Here’s to the beginning of your Galaxy Koi Betta journey!

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