Celestial Pearl Danio (Galaxy Rasbora) – Tank Mates & Full Details!

The Celestial Pearl Danio, affectionately known as Galaxy Rasboras, are an exceptional choice for aquarists seeking to introduce a splash of natural color to their aquariums.

Thanks to their convenient care requirements, their popularity in nano and larger aquariums has skyrocketed.

In 2006, the world was introduced to the Celestial Pearl Danio, a recently discovered freshwater species native to small ponds in Myanmar.

They were initially classified as Celestichthys margaritatus due to their unique beauty.

However, their sudden popularity put enormous pressure on their wild population, bringing the species perilously close to endangerment.

Fortuitously, 2008 marked the commencement of successful breeding in captivity, providing a lifeline for the wild population.

Around this time, scientists found them to be part of the Danio family, not the Rasbora species, leading to their reclassification as Danio margaritatus.

Despite the stabilization of their wild population, responsible stewardship is crucial to their continued survival.

Ensuring the health and prosperity of your Celestial Pearl Danios means purchasing only from reputable sellers or breeders and ensuring you are fully prepared to care for them.

In this comprehensive guide, we’ll navigate through everything related to Celestial Pearl Danio care, from dietary needs to breeding.

Quick Stats About Celestial Pearl Danio (Galaxy Rasbora)

Scientific name: Danio margaritatus
Common names: Celestial pearl danio, galaxy rasbora, fireworks rasbora
Distribution: Myanmar and northern Thailand
Size: 0.75–1 inch
Life expectancy: 3–5 years
Color: Dark blue with white/yellow spots in a galaxy pattern
Diet: Omnivore
Temperament: Peaceful
Minimum tank size: 10 gallons
Temperature: 71–78°F (21.6–25.5°C)
pH: 6.5–7.5
Hardness: 1–5 dGH
Care level: Moderate
Breeding: Egglayer

Appearance of Celestial Pearl Danio (aka Galaxy Rasbora)

Possessing an allure that’s out of this world, the Celestial Pearl Danio, also affectionately known as the Galaxy Rasbora, has won the hearts of many aquarists around the globe.

Their dazzling aesthetics is undoubtedly their most alluring characteristic and the key element that sets them apart in the freshwater aquarium world.

Embellished with a deep, ethereal blue body, these petite marvels feature a series of pearl-like spots across their form, creating a celestial spectacle reminiscent of a star-studded galaxy — hence their popular moniker, Galaxy Rasbora.

Their vivid display does not stop there. In a striking contrast against their blue bodies, the fins of these Danios boast a radiant orange or fiery red hue, similar to the flush of a cosmic nebula.

Their abdomen also sports the same vibrant color, offering an additional splash of contrast.

Looking closer, one can’t miss the black stripes adorning their fins. They’re lined with translucent sections that create an intriguing visual effect, further amplifying their galactic aesthetic.

But this level of detail isn’t where the fascinating differences end. Sexual dimorphism in this species enables you to distinguish males from females.

Males, more slender and vibrantly colored than their female counterparts, display more pronounced shades of red. Females, on the other hand, present a more rounded body profile and somewhat subdued hues.

Natural Habitat of Celestial Pearl Danio (Galaxy Rasbora)

To understand the needs of the Celestial Pearl Danio (Galaxy Rasbora) and provide them optimal care, it’s essential to learn about their native environment.

These celestial beings originate from shallow, freshwater ponds laden with lush vegetation, located in Myanmar.

These serene ponds, teeming with abundant plant life, provide excellent water clarity and purity.

The presence of rich flora not only ensures water quality but also contributes to a low salt and mineral content, perfect for the Celestial Pearl Danios.

In their natural habitats, they bask in a tranquil environment with negligible water turbulence, a crucial element to replicate in their home aquarium to keep stress at bay.

Origin and Distribution

It wasn’t until 2006 that the world became aware of the existence of Celestial Pearl Danios (Galaxy Rasboras). These stunning creatures were initially discovered in the remote regions of Myanmar, inhabiting serene, vegetation-rich ponds.

Their scientific name initially assigned was Celestichthys margaritatus, highlighting their pearl-like spots and mesmerizing beauty.

Their immediate appeal created an enormous demand in the aquarium trade, threatening the stability of the wild populations.

Thankfully, by 2008, captive breeding programs were initiated, and the wild populations have since recovered.

In terms of their scientific classification, they were later recognized as a member of the Danio family, hence the new name, Danio margaritatus.

However, their alternative common name, Galaxy Rasbora, continues to be used due to its popularity among aquarium enthusiasts.

Growth, Size, & Lifespan of Celestial Pearl Danio (Galaxy Rasbora)

Despite their tiny stature, these aquatic gems pack an impressive array of visual appeal into their small bodies.

On reaching maturity at around 3 months of age, the average Celestial Pearl Danio (Galaxy Rasbora) grows to approximately an inch in length.

Each individual is a remarkable sight to behold, with a splendid array of colors and patterns densely packed into their petite frame.

In an optimal environment with the right care, these celestial beings can live a full and healthy life, typically ranging between 3 to 5 years.

Their compact size, coupled with their non-aggressive and peaceful nature, makes them an excellent choice for community tanks.

However, they require a pristine environment to flourish. Subpar water conditions, overcrowding, or inadequate diet can lead to stress and health issues, potentially reducing their lifespan.

Remember, mastering the care of Celestial Pearl Danio (Galaxy Rasbora) involves understanding their biology, habitat, and individual needs.

Each aspect is interconnected, creating a comprehensive picture that shapes their care routine, ultimately leading to a healthier, happier, and vibrant Danio population in your aquarium.

Behavior and Temperament

If you’re fascinated by the allure of the Celestial Pearl Danio, also known as Galaxy Rasbora, it’s not just about the vibrant colors and cosmic patterns.

Understanding their behavior and temperament is equally essential. These little beings are peaceful by nature and display a unique set of behaviors that further amplify their charm.

These tiny freshwater fishes are schooling creatures, meaning they prefer to stay in groups.

Their schooling nature not only enhances their survival skills but also exhibits a beautiful visual spectacle, adding a dynamic feel to your aquarium.

Unlike some other schooling fish, Celestial Pearl Danios tend to swim in the mid to lower regions of the aquarium.

Notably, males can sometimes display territorial behavior, particularly during breeding periods. However, they usually remain peaceful and harmonious within their group and with other suitable tank mates.

Providing an aquarium environment that mirrors their natural habitat will help ensure their contentment and maintain a healthy demeanor.

Perfect Celestial Pearl Danio (Galaxy Rasbora) Tank Setup

Creating an ideal home for your Celestial Pearl Danio or Galaxy Rasbora is about understanding their natural habitat and mirroring those conditions.

Let’s break down the essentials of an optimal tank setup.

Tank Size

Despite their petite size, these celestial beauties prefer a spacious environment to swim freely. A 10-gallon tank serves as an excellent starting point for a small school of Galaxy Rasboras, ensuring enough room for natural behavior.


Choosing the right substrate is crucial as it influences both water quality and aesthetics. Opt for fine sand or smooth gravel. These options mimic the natural bottom of the clear ponds where these fish originate and are gentle on their delicate bodies.

Decorations and Hiding Spots

Celestial Pearl Danios (Galaxy Rasboras) love to hide and explore. Incorporate natural plants, rocks, and driftwood to provide them with ample hiding spots. Live plants also help maintain water quality by absorbing nitrates.

Water Parameters

Maintaining optimal water parameters is crucial to the health and happiness of your fish. Ideal water conditions for Galaxy Rasboras include a temperature range of 73-79°F, a pH level between 6.5-7.5, and soft to moderately hard water.

Filtration and Aeration

These fish prefer clean, slow-moving waters. Therefore, a gentle filtration system is crucial to remove contaminants and ensure water purity. However, excessive water movement might stress these tranquil beings.


While Galaxy Rasboras aren’t overly picky about lighting, a moderately lit tank that mimics their natural, sun-dappled environment is ideal. Too much light could lead to algae growth and cause stress to the fish.

Tank Mates

Due to their peaceful nature, Celestial Pearl Danios cohabit well with other non-aggressive species. Good choices include Pygmy Corydoras, Neon Tetras, and Guppies. Remember, compatibility is key to maintaining a stress-free environment.


These fish are omnivores. A balanced diet of high-quality flake food, along with freeze-dried or live food like Daphnia, Brine Shrimp, or Bloodworms, will keep your Galaxy Rasbora in vibrant health.

In conclusion, creating the perfect home for your Celestial Pearl Danio (Galaxy Rasbora) requires attention to detail, a firm understanding of their requirements, and a passion for their care.

By following these steps, you’re set to create an aquatic haven that mimics their natural habitat, bringing a piece of the celestial wonder into your home.

Tank Maintenance for Celestial Pearl Danio (Galaxy Rasbora)

Creating a cozy home for your Celestial Pearl Danio or Galaxy Rasbora doesn’t end at setting up the tank. Regular maintenance is crucial to keep these stunning creatures healthy and the aquarium sparkling.

Here’s a detailed guide to help you master the art of tank maintenance for these celestial wonders.

Regular Water Changes

One of the most critical aspects of tank maintenance is performing regular water changes. Clean water is vital for the health of your Celestial Pearl Danio.

As a general rule, aim to replace about 20-30% of the tank water every week. This practice helps in maintaining the right water parameters, removing harmful toxins, and preventing the build-up of waste materials.

Always ensure the new water matches the temperature and pH of the existing tank water to avoid stressing your Galaxy Rasbora.

Cleaning the Tank and Decorations

While water changes maintain the overall health of your tank, don’t forget about cleaning the tank and decorations. Over time, algae can form on the tank walls and decor items.

Use a gentle algae scrubber to clean the inside of the tank without scratching the glass. For the decorations, a soft brush works well.

Remember, cleanliness is key to preventing disease and promoting a visually appealing environment for your Celestial Pearl Danio.

Filter Maintenance

The filter plays a critical role in keeping the water clean and healthy for your Galaxy Rasbora. Rinse the filter media in the water you remove during the regular water change to keep beneficial bacteria alive.

Generally, filters should be checked every month, but if your tank seems cloudy or the water flow slows, it may be time for a quick check-up.

Monitor Fish Health

An integral part of tank maintenance is observing your Celestial Pearl Danio regularly. Look out for any changes in behavior, color, or appetite.

Unusual swimming, lethargy, spots, or faded colors can indicate potential health issues. Quick action can prevent the spread of disease and ensure the continued health of your Galaxy Rasbora.

In essence, maintaining a perfect home for your Celestial Pearl Danio (Galaxy Rasbora) involves more than just feeding them.

Regular water changes, cleaning, filter maintenance, and vigilant monitoring of fish health are all part of the package.

This maintenance regimen will keep your tank in top shape, making it a welcoming home for these celestial beings.

Acclimating Celestial Pearl Danio (Galaxy Rasbora)

The day has come! Your Celestial Pearl Danios, or Galaxy Rasboras, are eager to explore their new home. But, before they can leap into their aquatic playground, it’s crucial to acclimate them properly.

This vital process prepares your fish for their new environment, helping to reduce stress and increase their chances of survival.

Start by letting the sealed bag containing your fish float in the aquarium for around 15-20 minutes. This phase aligns the temperature within the bag with that of the tank water.

After this, slowly introduce small quantities of the tank water into the bag every 10 minutes. This gradual addition allows your Celestial Pearl Danios to adjust to the new water chemistry at their own pace.

Finally, after about an hour, use a net to carefully transfer your fish into the tank. Remember, don’t empty the bag’s water into the aquarium; it may contain unwanted elements.

Celestial Pearl Danio Diet and Feeding

Feeding your Celestial Pearl Danio (Galaxy Rasbora) requires a thoughtful approach. Providing a diverse diet ensures they get the nutrients they need to thrive and display their stunning colors.

Here’s an in-depth guide to their dietary preferences:

Diverse Diet

The Galaxy Rasbora prospers on a wide-ranging diet. This includes high-quality flakes or micro-pellets, specifically tailored for small tropical fish. These prepared foods deliver vital nutrients to ensure their overall health.

The Thrill of the Hunt

Celestial Pearl Danios have a keen appetite for live foods. Their favorites include brine shrimp, daphnia, and bloodworms. These provide much-needed protein and replicate the hunting experience. Frozen variants are also acceptable but thaw them first before serving.

The Green Course

Despite their carnivorous nature, these little swimmers occasionally enjoy nibbling on soft plant matter or algae. A bit of green in their diet ensures they’re receiving a balanced meal.

Remember, overfeeding can be detrimental to your fish’s health and the tank’s cleanliness. Only offer what they can consume within 2-3 minutes, and maintain a feeding schedule of twice a day.

This will keep your Celestial Pearl Danio happy and healthy in their new home.

Celestial Pearl Danio Tank Mates

Creating a harmonious aquatic community is vital for the wellbeing of your Celestial Pearl Danio, also known as the Galaxy Rasbora.

Here’s a rundown of the ideal companions and those to avoid for your peace-loving Danios:

Top Tank Mates:

  1. Neon Tetras: Known for their vibrant colors and peaceful temperament, Neon Tetras make perfect companions for your Celestial Pearl Danios.

  2. Cherry Shrimps: These small, non-aggressive crustaceans add a unique dynamic to your tank without disturbing the Danios.

  3. Dwarf Gouramis: Just like Danios, Dwarf Gouramis prefer calm waters. They’re peaceful, easy-going, and exhibit stunning colors.

  4. Harlequin Rasboras: This species is a great companion due to its similar size and non-aggressive behavior.

  5. Corydoras Catfish: With their peaceful demeanor and bottom-dwelling habits, they’re a perfect match for your Danios.

  6. Otocinclus Catfish: Their preference for algae makes them a great choice, keeping your tank clean without posing a threat to the Danios.

  7. Ghost Shrimps: They’re peaceful, tiny, and interesting to observe, making them a great addition to a Danio community tank.

Tank Mates to Avoid:

Avoid larger, more aggressive fish which might view the Danios as prey.

Some examples include:

  1. Betta Fish: Despite their beauty, they are territorial and may become aggressive.

  2. Cichlids: Most cichlids are aggressive and would likely bully or eat the Danios.

  3. Oscar Fish: Their large size and predatory nature make them a threat.

  4. Arowanas: Being predatory by nature, they may see your Danios as a snack.

  5. Goldfish: These cold-water fish have different temperature requirements, which are not compatible with Danios.

Breeding Celestial Pearl Danio and Fry Care

Breeding Celestial Pearl Danios (Galaxy Rasboras) is a fulfilling experience.

Here’s a detailed guide on the process and fry care:

Preparing for Breeding:

  1. Separate Tank: A separate, small breeding tank (5-10 gallons) is a must. This tank should have a fine-leaved plant or a breeding mop, where Danios will lay eggs.

  2. Diet: A diet rich in live foods will help condition the fish for breeding.

  3. Water Conditions: Maintain a slightly acidic pH (6.5-7) and a temperature around 73-79°F.

Breeding Process:

  1. Pairing: A healthy, mature male and female are placed together in the breeding tank.

  2. Spawning: The female lays her eggs on the plant or breeding mop, which the male fertilizes.

  3. Post-Spawning: After spawning, remove the parents to prevent them from eating the eggs.

Fry Care:

  1. Feeding: Initially feed the fry infusoria or commercially available fry food. As they grow, you can introduce brine shrimp nauplii.

  2. Water Quality: Keep the water clean and stable. Regular, small water changes are crucial for the fry’s survival.

  3. Growing Out: Once the fry are large enough, you can slowly introduce them to the main tank.

Remember, patience is key when breeding Celestial Pearl Danios.

With proper care and attention, you’ll soon have a school of colorful, energetic new additions to your aquarium community.

Signs of Stress in Celestial Pearl Danio

As fish-keepers, it’s important to notice signs of stress in your Celestial Pearl Danio or Galaxy Rasbora.

The sooner we spot stress, the faster we can address the problem:

  1. Hiding: If your normally active Danio is hiding more often, it could be a sign of stress.

  2. Lethargy: Lack of energy and enthusiasm might suggest that something’s not right.

  3. Loss of Appetite: A stressed fish might eat less or even stop eating altogether.

  4. Change in Color: Watch out for color fading or darkening, signs of stress or illness.

Common Health Issues and Treatments for Celestial Pearl Danio

Like all fish, Galaxy Rasboras are susceptible to certain health issues.

Here are some common problems and their solutions:

  1. Ich: This is a common parasitic infection, identifiable by white spots on the fish’s body. Treat it by raising the tank’s temperature slightly and using over-the-counter medications.

  2. Fin Rot: Fin rot is often due to poor water conditions, leading to bacterial or fungal infections. Improve the water quality and use appropriate treatments.

  3. Swim Bladder Disease: If your fish has difficulty swimming or is floating in an unusual manner, it might have a swim bladder issue. Usually, feeding them a pea (with the shell removed) can help clear up the problem.

Additional Tips for a Healthy Aquarium

Maintaining a healthy aquarium is the key to happy fish.

Here are a few extra tips:

  1. Regular Testing: Monitor the water’s pH, nitrate, nitrite, and ammonia levels.

  2. Don’t Overcrowd: A crowded tank can stress fish and promote disease.

  3. Avoid Overfeeding: Feed your fish only what they can eat in a few minutes, once or twice a day.

Should You Get a Celestial Pearl Danio for Your Aquarium?

The Celestial Pearl Danio, also known as the Galaxy Rasbora, is a perfect choice if you’re seeking a beautiful, peaceful, and relatively easy-to-care-for fish.

They’re adaptable, brightly colored, and small enough for most home aquariums.

However, remember they do require specific conditions to truly thrive. This includes a well-planted tank, stable water conditions, and a diet of high-quality food.

If you can provide these, a Celestial Pearl Danio can be a fantastic addition to your aquatic community!

Conservation Status of Celestial Pearl Danio

While it’s true that the Celestial Pearl Danio, also known as the Galaxy Rasbora, was discovered in a limited geographic area, its status isn’t presently critical.

Its popularity in the aquarium trade has led to increased breeding in captivity, reducing pressure on wild populations.

However, like all species, it’s crucial to promote sustainable and ethical practices when acquiring these fish.

Ensuring your Danios are captive-bred not only supports the species’ conservation but also provides healthier fish better suited for aquarium life.

Availability and Pricing

The Celestial Pearl Danio’s popularity among fish enthusiasts means that it is widely available both in local pet stores and online.

The price can vary, typically ranging from $3 to $6 per fish, based on size, age, and retailer.

While this might be more than you’d pay for common tetras or guppies, the vibrant color and captivating behavior of the Galaxy Rasbora make it well worth the investment.

Frequently Asked Questions About Celestial Pearl Danio

Q – How long do Celestial Pearl Danios live?

Ans – With proper care and optimal conditions, a Celestial Pearl Danio can live up to 3-5 years.

Q – Can Celestial Pearl Danios live alone?

Ans – They are a schooling fish and prefer to live in groups of at least 6. They may become stressed and prone to illness if kept alone.

Q – What do Celestial Pearl Danios eat?

Ans – They are omnivorous and thrive on a varied diet of high-quality flake food, small live or frozen foods like brine shrimp and Daphnia.


In conclusion, the Celestial Pearl Danio, or Galaxy Rasbora, is an exquisite jewel of the aquarium world. Their striking colors, peaceful demeanor, and manageable size make them an excellent choice for both novice and seasoned aquarists.

By providing them with a carefully maintained habitat and a varied diet, you can enjoy the beauty and intrigue of these freshwater marvels right in your home.

Their conservation status urges us to prioritize captive-bred fish, supporting sustainable practices and the health of our aquariums.

Whether you’re captivated by their star-like spots or their social schooling behavior, there’s no doubt that adding Celestial Pearl Danios to your tank will bring a splash of celestial charm to your aquatic community.