Celestial Pearl Danio (Galaxy Rasbora) Complete Care Guide

Looking for a low-maintenance, colorful fish for your aquarium? Consider the Celestial Pearl Danio.

Easy to care for and with an iridescent appearance, these peaceful fish are a popular choice.

Captive breeding has stabilized their population, making them a great addition to any tank.

Our care guide covers everything from water parameters to breeding habits. Dive into the world of Celestial Pearl Danios with confidence.

Species Summary

Due to their extraordinary appearance, demand for these fish skyrocketed in the aquarium industry, rapidly declining the wild population and placing the species in danger. Fortunately, in 2008, breeders began breeding the fish in captivity, which has since stabilized the wild population.

It was also discovered around the same time that the fish belonged to the Danio family instead of the Rasbora family, and they were given the new scientific name of Danio margaritatus.

Celestial Pearl Danios, also known as Galaxy Rasboras, is now a highly sought-after aquarium fish that can add a splash of natural beauty to any tank, and proper care is necessary to ensure that these majestic creatures reach their full potential.

It’s our responsibility to be cautious when it comes to Celestial Pearl Danios. This means only buying from reliable sellers and getting fish you know you can care for.

Average Celestial Pearl Danio Size


You’ll be happy to know that these little fish only grow about an inch long when fully grown! This makes them perfect for small aquariums, but remember that they are social creatures and must be kept in groups of at least five or six.

Here are a few things you should know about the average size of celestial pearl danios:

  • These fish are part of the Danio family, not the Rasbora family, and typically reach a length of 1 inch when fully grown.
  • Males tend to be more slender and vibrant than females, but both sexes grow to be about the same size.
  • The small size of these fish makes them a popular choice for aquascaping enthusiasts, as they can add a pop of color to a tank without taking up too much space.


If you’re looking for a fish with a decent lifespan that’ll give you years of enjoyment, it’s important to understand the factors that can affect the longevity of your aquatic pets.

Celestial Pearl Danios, in particular, have a 3-5 years lifespan in captivity, but this can be accomplished with proper care and attention. One of the key factors in ensuring a long and healthy life for your Celestial Pearl Danios is maintaining a clean and well-filtered aquarium with clear and pure water.

These fish are sensitive to changes in water chemistry, so keeping the pH levels between 6.5 to 7.5 and the water hardness between 2-10 dKH is important.

Another important factor in the lifespan of Celestial Pearl Danios is ensuring that they are housed in an environment that provides plenty of hiding places and vegetation. These fish love to explore their surroundings but also need a place to retreat when they feel stressed or threatened.

Additionally, it’s important to ensure that your Celestial Pearl Danios are fed a balanced diet that includes a variety of foods, such as algae, plants, plankton, and small vertebrae.

You can help your Celestial Pearl Danios live a long and healthy life in your aquarium with proper care and attention.


These fish are known for their deep blue base coloration with pearl-like spots and deep orange or red fins.

Celestial Pearl Danios possess impressive fins compared to their body size and shape. Rising from the lower third of their body, a tall, colorful dorsal fin acts like a sail.

Additionally, two pelvic fins and a wide anal fin are visible. Running through each fin are two black lines, with some transparent areas of the fins creating a distinct look.

Another intriguing feature of these fish is sexual dimorphism, which refers to the physical differences between males and females. Although the distinctions are not obvious, recognizing them can be very beneficial.

Typically, males are more slender than their female counterparts. In addition, males tend to have a more vivid red coloration than females’ slightly duller orange hues.

Their small size, only growing up to an inch in length, allows them to be kept in smaller tanks, but they still add a lot of color to the environment.

Not only are they visually appealing, but they also love a well-planted tank with plenty of vegetation to explore. They are peaceful fish that group up but also explore on their own.

While males may fight over females, having more females than males in the tank can help prevent aggressive behavior.

Celestial Pearl Danio Care

Caring for Celestial Pearl Danios is simple – they’re pretty hardy and can be handled by someone with even a bit of knowledge about setting up aquariums. But it’s still important to give them the right environment – they’re prone to stress, and their health can suffer if their needs are unmet.

Give your fish an appropriate habitat to ensure they are happy and healthy. Neglecting the basics can lead to issues, and so do the small stuff. Doing things right from the start will benefit both you and your fish.

Tank Size

For the health and well-being of your Celestial Pearl Danios, ensure they have a tank size of at least 10 gallons. These peaceful fish require ample swimming space and a good environment to explore. A smaller tank size can cause stress and deteriorating health, ultimately shortening their lifespan.

Furthermore, a larger tank size benefits your fish and allows for more aquascaping options. You can add more plants and decorations to create a beautiful and natural environment for your fish to thrive in.

A larger tank also helps maintain water quality, providing more surface area for beneficial bacteria to grow and filter out toxins.

By choosing a tank size of at least 10 gallons, you can ensure that your Celestial Pearl Danios are happy and healthy in their home.

Water Parameters

Maintaining proper water parameters is key to keeping your beloved CPDs healthy and thriving in their aquarium home. These little fish need clear and pure water with low salt and mineral levels, so test and adjust your water accordingly.

The recommended temperature range is 73°F to 79°F, with pH levels between 6.5 to 7.5 and water hardness at 2-10 dKH. To ensure optimal health, provide your CPDs with a well-planted tank to create a natural environment and mimic their natural habitat.

It’s important to note that CPDs thrive in low water flow environments. Therefore, ensuring your filtration system is not too strong is best.

It’s important to remember that your CPDs are sensitive to their environment and can be prone to stress and deteriorating health if their water parameters are not maintained. Keep their tank clean and monitor their water conditions regularly.

A healthy environment will promote their bright colors and lively behavior. Remember, buying from reputable sellers and breeders benefits the health of your CPDs and helps protect the wild population.

With proper care and attention to water parameters, your celestial pearl danios will thrive in their aquarium home and continue to add color and life to your tank.

Setting Up Their Tank

Get ready to create a stunning aquatic landscape as we dive into the setup of your CPD tank!

Start by choosing a tank that holds at least 10 gallons of water. Ensure it has a lid to prevent your fish from jumping out and keep the temperature stable.

Vegetation is a must for your CPD tank, so add some plants like Java moss, Java fern, or Anubias. These plants provide hiding places for your fish and help keep the water clean by absorbing nitrates and other waste.

Dark fine sand is ideal because it’s good for plants and easy to clean.

A low water flow rate is preferred, so choose a filter that doesn’t create too much current. You can also add some rocks, driftwood, and other decorations to create a natural-looking environment for your fish.

Finally, let the tank cycle for a few days before adding your CPDs to make sure the water is stable and free of harmful chemicals.

Potential Diseases

Now that you’ve set up the perfect tank for your celestial pearl danios, it’s important to be aware of potential diseases that can affect your fish.

Despite being hardy, stress and poor water conditions can make them susceptible to fin rot. This disease can be caused by bacteria or fungi and is characterized by the deterioration of the fins. If left untreated, it can spread to other body parts and lead to death.

Another disease that can affect your celestial pearl danios is ich, also known as white spot disease. This is a parasitic infection that causes white spots to appear on the fish’s body. It’s highly contagious and can spread quickly in a crowded tank. If left untreated, it can lead to the death of your fish.

As a responsible owner, it’s important to monitor your fish for any signs of illness and take immediate action to prevent the spread of disease.

  1. Keep a close eye on your fish for any signs of illness, such as lethargy, loss of appetite, or unusual behavior.
  2. Seek advice from a veterinarian specializing in fish if you notice any unusual symptoms.
  3. Learn how to properly clean and maintain your tank to prevent the spread of disease.
  4. Remember that prevention is key when it comes to keeping your fish healthy.
  5. Avoid overcrowding and make sure your tank is properly filtered and aerated.
  6. Provide your fish with a balanced diet and a stress-free environment.

Remember, the health and well-being of your celestial pearl danios depend on you. Take the necessary steps to ensure their environment is clean and balanced, and always watch for any signs of illness.

By providing them with proper care, you can enjoy the beauty of these unique fish for years to come.

Food & Diet

Feeding your fish the right diet is crucial for their health and happiness, and luckily, celestial pearl danios are fairly easy to feed and will happily eat a variety of foods.

As omnivores, they will eat algae, plants, plankton, and small vertebrae, so a varied diet is important.

You can feed them a mix of high-quality flakes, freeze-dried or frozen foods like bloodworms and brine shrimp, and even live foods like daphnia and mosquito larvae. Ensure not to overfeed them, which can lead to health issues and poor water quality.

It’s also important to note that celestial pearl danios are active swimmers who need a balanced diet to maintain their energy levels.

Make sure to feed them small meals multiple times a day instead of one large meal, and always remove any uneaten food after a few minutes to prevent it from decomposing and polluting the water.

With a proper diet, your celestial pearl danios will be happy, healthy, and vibrant additions to your aquarium.

Behavior & Temperament


Understanding the behavior and temperament of celestial pearl danios is essential for maintaining a peaceful aquarium environment. These fish are known for their peaceful nature but can become stressed and prone to deteriorating health without proper care.

It’s best to keep these fish in groups of at least 5-6, as they are social creatures and enjoy the company of their kind. Males may fight over females, so having more females than males in the tank is recommended.

These fish are also known for their exploratory nature. They enjoy swimming through vegetation and hiding in caves and crevices. Providing a well-planted environment and plenty of hiding places will help them feel secure and reduce stress.

It’s important to note that these fish are not aggressive towards other peaceful species, making them ideal tank mates.

With proper care and attention, celestial pearl danios can thrive in an aquarium environment and add a beautiful touch of color to the tank.

Tank Mates

If you want to add new friends to your aquarium, it’s important to consider which species will get along with your peaceful celestial pearl danios. These little guys are best suited to living with similarly sized and peaceful species that won’t bully or stress them out.

Celestial Pearl Danios are a great companion for similarly sized, peaceful fish such as Guppies, Neon Tetras, and other non-aggressive species. To provide these little fish with their own space, you could look for fish that prefer to occupy the higher levels of the tank.

Tetras, such as regular, green, and ember varieties, are great additions to the tank. Guppies, Killifish, and Cory catfish also make excellent tank mates. If you’re looking for something more unique, try adding Molly fish, Red cherry shrimp, Endler’s livebearer, Amano shrimp, Honey gourami, or Sparkling gourami.

Snails can also be added to your tank without issue, and they won’t bother your danios and will help keep your tank clean.

Just be sure to avoid aggressive or territorial species, as they can stress out your celestial pearl danios and even cause harm. Stick with peaceful companions, and your little guys will be happy and healthy.


Breeding Celestial Pearl Danios is not difficult, but it requires some preparation.

First, you’ll need a separate spawning tank with live plants, a sponge filter, and appropriate water parameters. Feeding the fish live food, such as baby brine shrimp or micro worms, will trigger the breeding process.

Once the female lays the eggs, they should be removed from the aquarium and placed in the spawning tank. This is because males will promptly consume them if they discover them!

The eggs will hatch in 2-4 days, and the fry can be fed small amounts of baby brine shrimp, micro worms, and crushed flakes.

Raising the fry can be tricky, as they are tiny and delicate. Keeping the water clean and providing enough food is essential.

A sponge filter or a gentle air stone can provide oxygen without disturbing the fry. Gradually increasing the amount of food and water changes will help them grow strong and healthy.

With proper care, the fry will reach maturity in 2-3 months and be ready to join their parents in the main tank. Breeding Celestial Pearl Danios can be a rewarding experience and can contribute to the conservation of this beautiful species.


Congratulations, you’re now equipped with all the information you need to properly care for Celestial Pearl Danios (Galaxy Rasboras) in your aquarium!

These fish are easy to care for and add a pop of color to any tank.

Remember to maintain their preferred water parameters, provide a varied diet, and choose appropriate tank mates to ensure their health and well-being.

With their peaceful and hardy nature, Celestial Pearl Danios make a great addition to any community tank.

With proper care, these fish can thrive in your aquarium for years. Happy fish keeping!