Celestial Pearl Danio Care: Tank Setup, Diet, Tank Mates, Diseases & More!

If you’re looking for a colorful and easy-to-care-for fish for your aquarium, the Celestial Pearl Danio might be the perfect choice for you. These small fish, also known as Galaxy Rasboras or simply CPDs, have become increasingly popular in recent years due to their unique appearance and low-maintenance needs. As an aquarium enthusiast myself, I can attest to the joy of watching these little fish swim around in their tank.

Celestial Pearl Danios require a well-planted aquarium with soft, slightly acidic water. They are peaceful and should be kept in groups of at least six. They feed on small live foods such as brine shrimp and daphnia, and their diet can be supplemented with high-quality flakes and pellets. Regular water changes and maintenance are essential for their health.

Despite their small size, Celestial Pearl Danios are full of personality and can be a great addition to any community tank.

In this article, I will provide you with everything you need to know about caring for these fascinating fish.

From tank setup and water parameters to feeding and breeding, I’ll cover all the essential information to help you create a thriving environment for your CPDs.

Celestial Pearl Danio 2

Celestial Pearl Danio Care: Species Summary


I first learned about Celestial Pearl Danios when I visited my local aquarium store.

These little fish are native to Southeast Asia, specifically Myanmar, and were only discovered by the aquarium trade in 2006. They are also known as Galaxy Rasboras or CPDs.


Celestial Pearl Danios have a relatively short lifespan of around 2-3 years. However, with proper care, they can live up to 5 years.


These fish are small, reaching only about 1 inch in length.

They have a distinctive iridescent blue-green body with orange-red spots on their sides. The males are more colorful and have a deeper blue hue than the females.


As mentioned, Celestial Pearl Danios are small, reaching only about 1 inch in length.

This makes them perfect for smaller aquariums and nano tanks.

Growth Rate

Celestial Pearl Danios are relatively slow growers, reaching their full size in about 6-8 months.

However, they are active and playful fish, so they will keep your aquarium lively and entertaining.

Behavior & Temperament

These little fish are peaceful and get along well with other small fish. They are also very active and like to swim in schools, so it’s best to keep them in groups of at least 6.

I have found that they are also quite curious and will often come to the front of the tank to investigate when I approach.

Male vs Female

As mentioned earlier, males are more colorful and have a deeper blue hue than females. Additionally, males have a more streamlined body shape, while females are slightly rounder.

In conclusion, Celestial Pearl Danios are a great addition to any aquarium, especially for those who are looking for smaller fish with a lot of personality.

With proper care, they can live a happy and healthy life in your aquarium for several years.

Tank Setup

Setting up the perfect tank for your Celestial Pearl Danios is crucial to their health and happiness. Here are some important factors to consider when creating their ideal environment:

Tank Size

The size of your tank will depend on how many Celestial Pearl Danios you plan to keep. For a small school of 6-8 fish, a 10-gallon tank will suffice.

However, if you plan to keep a larger school, you’ll need a bigger tank. I personally keep my Celestial Pearl Danios in a 20-gallon long tank, which gives them plenty of room to swim and explore.


While Celestial Pearl Danios don’t require intense lighting, it’s important to provide them with a consistent light cycle.

I recommend using a timer to ensure they get 8-10 hours of light per day. This will help regulate their behavior and keep them healthy.

Filtration & Aeration

A good filtration system is essential for keeping your tank clean and your fish healthy.

I use a hang-on-back filter with a sponge and bio-media to provide mechanical and biological filtration. In addition, I also use an air stone to increase oxygenation and water flow.


Celestial Pearl Danios are tropical fish and require a consistent water temperature between 72-78°F.

I use a submersible heater to keep the water at a constant temperature, and I highly recommend investing in a thermometer to monitor the temperature.


When it comes to substrate, Celestial Pearl Danios prefer a fine-grained sand or gravel.

I use black sand in my tank, which not only looks great but also provides a natural environment for my fish to explore.


Celestial Pearl Danios love to hide and explore, so it’s important to provide them with plenty of hiding spots and caves.

I use a combination of rocks, driftwood, and PVC pipes to create a natural-looking environment for my fish.


Live plants not only provide a natural look to your tank, but they also help improve water quality and provide hiding spots for your fish.

I personally use Java Fern, Anubias, and Amazon Sword in my tank, but there are many other plant options to choose from.

Water Quality

As a proud owner of Celestial Pearl Danios, I know how important it is to maintain the right water quality for these little fishes.

Here are a few things you need to know about maintaining water quality for your Celestial Pearl Danios.

Water Temperature

The ideal water temperature for Celestial Pearl Danios is between 72°F and 78°F.

It is important to maintain a consistent temperature in their tank, as sudden fluctuations can cause stress and even death. I recommend using a reliable aquarium thermometer to monitor the temperature regularly.

Water pH

Celestial Pearl Danios thrive in slightly acidic to neutral water, with a pH range of 6.5 to 7.5. It is important to avoid sudden changes in pH levels, as it can cause stress and harm to your fishes.

I suggest testing the water regularly using a pH test kit and making gradual adjustments as needed.

Water Hardness

Celestial Pearl Danios prefer moderately hard water, with a range of 5 to 12 dKH. Hard water helps maintain the pH stability and provides essential minerals for the fishes.

However, it is important to avoid extremely hard water, as it can cause issues with their health. I recommend testing the water hardness regularly and making adjustments as needed.

Water Changes

Regular water changes are essential for maintaining good water quality for your Celestial Pearl Danios. I suggest changing 20% of the water every week using a siphon to remove any debris or waste.

It is important to use a water conditioner to remove any chlorine or chloramines from the tap water before adding it to the tank.

By following these tips, you can maintain the ideal water quality for your Celestial Pearl Danios and ensure their health and happiness in your aquarium.

Remember to monitor the water quality regularly and make adjustments as needed to keep your fishes healthy and thriving.

One time, I neglected to monitor the water temperature in my Celestial Pearl Danio tank for a few days, and the temperature rose to 82°F. My fishes became lethargic and started gasping for air.

I immediately lowered the temperature and did a partial water change. Thankfully, my fishes recovered quickly and taught me the importance of maintaining consistent water temperature for their health.

Tank Maintenance

Maintaining a clean and healthy tank is crucial for the well-being of your Celestial Pearl Danios. I personally make sure to clean my tank at least once a week to keep it in top condition.

One of the most important aspects of tank maintenance is regular water changes. I recommend changing about 25% of the water in your tank once a week. This helps remove any excess waste and toxins that can build up over time.

Another important aspect of tank maintenance is keeping the filter clean. I make sure to clean my filter once a month to ensure that it is working properly. It’s also important to replace the filter media every few months to keep it functioning effectively.

Lastly, it’s important to regularly test the water parameters in your tank. I use a water testing kit to check the pH, ammonia, and nitrite levels in my tank. This helps me ensure that the water is safe and healthy for my Celestial Pearl Danios.

Overall, keeping up with regular tank maintenance is key to ensuring the health and happiness of your Celestial Pearl Danios. By following these simple steps, you can help ensure that your fish thrive in their environment.

Tank Mates

Compatible Fish Species

When it comes to choosing tank mates for Celestial Pearl Danios, it is important to select species that are peaceful and can thrive in similar water conditions.

Some great options include Cherry Barbs, Neon Tetras, and Pygmy Corydoras. These species are all small, peaceful, and will not compete with Celestial Pearl Danios for food or territory.

Incompatible Fish Species

It is important to avoid aggressive or territorial species when selecting tank mates for Celestial Pearl Danios.

Large or aggressive fish such as Cichlids or Gouramis should be avoided, as they may bully or even eat the smaller Celestial Pearl Danios.

Additionally, avoid any species that require significantly different water conditions, as this can cause stress and health issues for both species.

How Many Celestial Pearl Danios Should be Kept Together

Celestial Pearl Danios are social fish and should be kept in groups of at least six individuals. This will help reduce stress and aggression within the group and promote healthy behavior.

Additionally, it is important to provide adequate space for the group. A minimum tank size of 10 gallons is recommended for a group of six Celestial Pearl Danios.

Personally, I have found that keeping Cherry Barbs with my Celestial Pearl Danios has been a great combination.

The colors of the two species complement each other well and they both thrive in similar water conditions.

However, it is important to always research and carefully consider the compatibility of any potential tank mates before adding them to your aquarium.

Overall, selecting the right tank mates for your Celestial Pearl Danios is crucial for their health and well-being. By choosing peaceful and compatible species, you can create a beautiful and harmonious aquarium environment.


As an owner of Celestial Pearl Danios, I have found that their diet is one of the most important factors in their overall health and well-being.

In this section, I will discuss what to feed your Celestial Pearl Danios, how often to feed them, and some tips to ensure they are getting the proper nutrition.

What To Feed

Celestial Pearl Danios are omnivores, which means they eat both plant and animal-based foods. In the wild, they feed on small insects, crustaceans, and algae.

To replicate their natural diet, I feed my Celestial Pearl Danios a variety of foods, including:

  • High-quality flakes or pellets
  • Frozen or live foods such as brine shrimp, bloodworms, and daphnia
  • Spirulina or other vegetable-based foods

It is important to vary their diet to ensure they are getting all the necessary nutrients.


I feed my Celestial Pearl Danios twice a day, once in the morning and once in the evening.

It is important not to overfeed them as this can lead to health issues such as obesity and poor water quality. I usually feed them only what they can eat in 2-3 minutes.


Here are some tips to ensure your Celestial Pearl Danios are getting the proper nutrition:

  • Remove any uneaten food after feeding to prevent it from decomposing and polluting the water
  • Offer a variety of foods to ensure they are getting all the necessary nutrients
  • Consider using a feeding ring or target feeding to ensure all fish get their fair share of food
  • Monitor their weight and adjust their diet as necessary

By following these tips, you can ensure your Celestial Pearl Danios are getting the proper nutrition they need to thrive.

Common Diseases


As with any fish, Celestial Pearl Danios are susceptible to various diseases. One common disease is Ich, which is caused by a parasite.

This disease is characterized by white spots on the fish’s body and fins. Another common disease is fin rot, which is caused by bacteria and can lead to the deterioration of the fins.

Dropsy is another disease that can affect Celestial Pearl Danios, which is caused by a bacterial infection and can cause the fish to become bloated and swollen.


The symptoms of Ich include white spots on the fish’s body and fins, as well as scratching against objects in the tank.

Fin rot is characterized by the deterioration of the fins, which can become ragged and frayed. Dropsy causes the fish to become bloated and swollen, and the scales may also become raised.


If you suspect that your Celestial Pearl Danio is suffering from a disease, it is important to take action quickly. Ich can be treated with medication, such as malachite green or copper sulfate.

Fin rot can be treated with antibiotics, and dropsy can be treated with Epsom salt baths or antibiotics. It is important to follow the instructions carefully when administering medication to your fish.


The best way to prevent diseases in your Celestial Pearl Danios is to maintain a clean and healthy tank environment. This includes regular water changes, proper filtration, and a balanced diet.

It is also important to quarantine any new fish before adding them to your tank to prevent the spread of disease.

Personally, I have had to deal with Ich in my Celestial Pearl Danio tank. It was a stressful experience, but I was able to treat the disease and prevent it from spreading to my other fish.

By following proper care guidelines and monitoring my fish closely, I have been able to keep my Celestial Pearl Danios healthy and happy.

Signs of a Healthy Celestial Pearl Danios

As a fish enthusiast, I have learned that keeping fish healthy requires attention to detail and a keen eye for signs of illness or distress. Here are some signs to look for when determining if your celestial pearl danios are healthy:

  1. Bright colors: A healthy celestial pearl danio will have bright and vibrant colors. They should have a metallic shine and their stripes should be well-defined.
  2. Active swimming: A healthy celestial pearl danio will be active and swim around the tank. They should not be lethargic or resting at the bottom of the tank for extended periods of time.
  3. Clear eyes: The eyes of a healthy celestial pearl danio should be clear and bright. There should be no cloudiness or discoloration.
  4. Healthy fins: The fins of a healthy celestial pearl danio should be intact and free of tears or damage. They should not be clamped to the body.
  5. Healthy appetite: A healthy celestial pearl danio should have a healthy appetite and eagerly eat food. They should not show disinterest in food or have trouble eating.

By paying attention to these signs, you can ensure that your celestial pearl danios are healthy and happy in their environment. Remember to keep their tank clean and provide them with a balanced diet to maintain their health and well-being.

Signs Your Celestial Pearl Danios Is Sick

I have been keeping Celestial Pearl Danios for a while now, and I have learned that these fish are relatively hardy and easy to care for. However, like any other living creature, they are susceptible to diseases and health problems. Here are some signs that your Celestial Pearl Danios may be sick:

  1. Loss of appetite: If your fish is not eating or is eating less than usual, it may be a sign of illness. In some cases, fish may stop eating altogether, which can lead to serious health problems.
  2. Lethargy: If your fish is spending more time than usual at the bottom of the tank or is not swimming around as much as usual, it may be a sign of illness. Healthy Celestial Pearl Danios are active and curious fish, so a lack of activity can be a warning sign.
  3. Abnormal swimming: If your fish is swimming erratically or is having trouble swimming, it may be a sign of illness. Some fish may swim sideways, upside down, or struggle to maintain their balance.
  4. Discoloration: If your fish is changing color or developing spots, it may be a sign of illness. Some diseases can cause discoloration, while others can cause spots or lesions on the skin or fins.
  5. Gasping for air: If your fish is spending more time than usual at the surface of the water or is gasping for air, it may be a sign of illness. This can be a sign of poor water quality or a respiratory problem.

If you notice any of these signs in your Celestial Pearl Danios, it is important to take action quickly.
The first step is to check the water quality in your tank, as poor water quality can be a common cause of illness.

If the water quality is good, you may need to consult a veterinarian who specializes in fish health to diagnose and treat your fish. Remember, early detection and treatment are key to keeping your fish healthy and happy.


Celestial Pearl Danio

Breeding Celestial Pearl Danios can be a fun and rewarding experience for any aquarist. Here are some tips on how to successfully breed these beautiful fish.

Breeding Setup

To successfully breed Celestial Pearl Danios, you need to set up a breeding tank. A breeding tank should be at least 10 gallons and should have a sponge filter to keep the water clean.

The water temperature should be between 72-78°F and the pH level should be around 7.0. It is important to provide plenty of hiding places for the fish to lay eggs. Use plants, rocks, and other decorations to create a natural environment for the fish.

How To Breed

Breeding Celestial Pearl Danios is relatively easy. The male will chase the female around the tank, and when he is ready to spawn, he will push her into a hiding spot and fertilize her eggs.

Once the female lays her eggs, remove the adult fish from the breeding tank to prevent them from eating the eggs. The eggs will hatch in about 24-36 hours.


After the eggs have hatched, feed the fry small amounts of baby brine shrimp or powdered fish food. It is important to keep the water clean and well oxygenated.

As the fry grow, you can gradually increase the size of their food. In about 2-3 months, they will be fully grown and can be moved to a larger tank.

I remember the first time I successfully bred Celestial Pearl Danios. I was so excited to see the eggs hatch and watch the fry grow. It was a truly rewarding experience that I will never forget.

Breeding Celestial Pearl Danios takes patience and dedication, but it is well worth the effort. With the right setup and care, you can enjoy watching these beautiful fish grow and thrive in your aquarium.

Product recommendations for Celestial Pearl Danios:

  1. Hikari Micro Pellets – This is a high-quality fish food that is perfect for Celestial Pearl Danios. It contains all the essential nutrients that your fish need to stay healthy and vibrant.
  2. API Aquarium Water Test Kit – It is important to keep an eye on the water quality in your aquarium, and this test kit makes it easy to do so. It includes tests for ammonia, nitrite, nitrate, and pH.
  3. Seachem Prime – This is a water conditioner that helps to detoxify ammonia, nitrite, and nitrate in your aquarium. It is safe for use with Celestial Pearl Danios and other fish.
  4. Fluval Plant and Shrimp Stratum – If you plan on keeping live plants in your aquarium, this substrate is a great choice. It provides the nutrients that plants need to thrive, and also helps to maintain a stable pH.
  5. AquaClear Power Filter – This filter is highly effective at removing debris and maintaining water quality in your aquarium. It is also very quiet and easy to maintain.
  6. Aqueon Aquarium Water Changer – This device makes it easy to perform regular water changes in your aquarium. It is designed to be safe and easy to use, and can help to keep your Celestial Pearl Danios healthy.
  7. Zoo Med Nano 10 External Canister Filter – This is a small and efficient filter that is perfect for smaller aquariums housing Celestial Pearl Danios. It is easy to install and maintain, and will keep the water in your aquarium clean and healthy.
  8. Marina LED Aquarium Kit – This is another great aquarium kit that is perfect for Celestial Pearl Danios. It includes a filter, heater, and LED lighting, and is easy to set up and maintain.


Overall, I have found that the Celestial Pearl Danio is a wonderful addition to any aquarium. They are easy to care for, beautiful to look at, and have a peaceful temperament.

One thing to keep in mind when caring for them is to make sure they have plenty of space to swim around. They are active fish and need room to move. It’s also important to keep the water clean and well-oxygenated.

I have personally enjoyed watching my Celestial Pearl Danios swim around and interact with each other. They are a joy to observe and have brought a lot of life to my aquarium.

If you are looking for a low-maintenance fish that is both beautiful and interesting, I highly recommend the Celestial Pearl Danio. With a little bit of care, they will thrive in your aquarium and provide you with hours of enjoyment.


As someone who has cared for Celestial Pearl Danios for a while now, I often get asked a lot of questions about these little fish. Here are some of the most frequently asked questions:

Q: How many Celestial Pearl Danios can I keep in my tank?

A: These fish are small and active, so they need plenty of swimming space. A good rule of thumb is to have at least 10 gallons of water per 10 fish. However, it’s always best to err on the side of caution and give them as much space as you can afford.

Q: What should I feed my Celestial Pearl Danios?

A: These fish are omnivores, so they will eat both plant and animal matter. A varied diet is best, so try to offer them a mix of flakes, pellets, frozen foods, and live foods like brine shrimp or daphnia. Don’t overfeed them, though, as they have small stomachs and can easily become bloated.

Q: Do Celestial Pearl Danios need a heater?

A: Yes, these fish are tropical and need a consistent water temperature between 72-78°F. A good quality heater is essential to keep their environment stable.

Q: Can I keep Celestial Pearl Danios with other fish?

A: Yes, these fish are generally peaceful and can be kept with other small, non-aggressive species. However, be careful not to overcrowd the tank and make sure all fish have enough space to swim and hide if needed.

Q: How often should I do water changes?

A: It’s important to maintain good water quality for your fish, so regular water changes are a must. Aim for a 25% water change every 1-2 weeks, depending on your tank size and stocking levels.

Personal Anecdote: When I first got my Celestial Pearl Danios, I was worried about their care and keeping them healthy. But with a little research and some trial and error, I’ve found that they are hardy and easy to care for. Watching them dart around my tank is a joy, and I’m always happy to answer questions from other fish enthusiasts who are interested in keeping these little gems.

Reference: Wikipedia.


Hi there! My name is Jacob, and I'm the founder of this Pet people blog that talks all about aquarium and fishkeeping. I've been passionate about fish and aquatic life since I was a kid, and I've spent countless hours learning about different species, their habitats, and how to create the perfect environment for them to thrive in.

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