Celestial Pearl Danio Care Guide: Tips for a Happy, Healthy Aquarium

Celestial Pearl Danios, also known as Galaxy Rasboras, are a captivating addition to your home aquarium. These small, brilliant fish exhibit a mesmerizing combination of iridescent blue-green bodies and sparkling pearl-like spots, making them an irresistible choice for aquarists.

These stunning freshwater fish are not only visually appealing, but they are also relatively easy to care for, making them an excellent option for both beginners and seasoned hobbyists. In this care guide, you will learn all about the essential requirements for keeping your Celestial Pearl Danios happy and healthy.

It’s no wonder why these charming fish have become so popular in recent years. With their unique patterns and straightforward care requirements, Celestial Pearl Danios are an ideal choice for anyone looking to add a touch of magic to their aquarium.

Species Overview

Celestial Pearl Danios are eye-catching, vibrant freshwater fish that brighten any aquarium. They’re known for their low-maintenance requirements, making them perfect for novice aquarists. These sparkling creatures come in a range of dazzling colors and patterns, providing visual appeal to your tank.

Their care requirements are fairly easy; they prefer cooler temperatures which may not even require a heater, depending on your home environment. Their peaceful temperament also makes them compatible with a variety of tank mates.

Here’s a table providing key details about Celestial Pearl Danios:

Property Details
Scientific name Celestichthys margaritatus
Common names Celestial Pearl Danio, Galaxy Rasbora
Distribution Southeast Asia
Size Up to 1 inch (2.5 cm)
Lifespan 3-5 years
Diet Omnivore
Temperament Peaceful
Minimum tank size 10 gallons (38 liters)
Temperature 72-76°F (22-24°C)
pH 6.5-7.5
Water hardness Soft to moderately hard (dH 2-15)
Care level Easy
Filtration/Water Flow Moderate
Water type Freshwater
Breeding Egg-scatterer
Breeding difficulty Moderate
Compatibility Suitable for community tanks with peaceful, similarly-sized fish

With their attractive appearance and easy-to-meet requirements, Celestial Pearl Danios make a stunning addition to your aquatic world. Enjoy watching these tiny gems swim around and enrich your tank with their splendid hues.

Celestial Pearl Danio Basics

Origins and Natural Habitat

Celestial Pearl Danios, also known as Galaxy Rasboras, originate from small ponds and slow-moving streams in Myanmar. The water in their natural habitats is usually clear, with a plethora of aquatic plants. When setting up an aquarium environment for these beautiful fish, it’s essential to mimic their natural habitat as closely as possible.

Size and Shape

These small freshwater fish typically grow up to a maximum length of 1 inch (2.5 cm). Their slender body is horizontally compressed, giving them a sleek appearance. The fins of Celestial Pearl Danios are relatively short, with a rounded shape. The caudal (tail) fin is small and slightly forked.

Their compact size makes them great inhabitants for nano aquariums or community tanks with delicate tank mates. Although small, their stunning appearance will certainly catch your eye.

Color and Markings

Your Celestial Pearl Danios have iridescent blue-green bodies covered in pearl-like spots, giving them a truly celestial appearance. Their fins feature fiery red-orange patterns, adding a lovely contrast to their overall color scheme. Their unique colors and markings make them a popular choice among aquarists looking to add color and brilliance to their tanks.


With proper care and attention, Celestial Pearl Danios can live for about 3-5 years in captivity. To ensure their health and longevity, provide them with a clean, well-maintained tank, proper water conditions, and a balanced diet. Remember, your fish will thrive when you maintain a consistent and stable living environment for them.

Tank Setup

Tank Size

To ensure your celestial pearl danios are comfortable and happy, it’s important to provide them with an appropriate tank size. A minimum tank size of 10 gallons is recommended for these fish, as they are schooling species and need enough space to swim around. If you plan on keeping a larger group, a 20-gallon tank or larger is better.

Water Parameters

Celestial Pearl Danios thrive in stable water conditions. Here are the ideal water parameters for these fish:

  • Temperature: 65° to 80° F (18° to 27° C)
  • pH Range: 6.5 to 7.5
  • Water Hardness: 1-5 dGH

It’s crucial to monitor these parameters consistently and ensure your tank’s water remains within the optimal range for your celestial pearl danios to stay healthy and stress-free.


Since celestial pearl danios are shy and timid fish, decorating your tank with plants, rocks, and driftwood will provide them with plenty of hiding spots and help them feel secure. It’s best to include live plants in their tank, such as Java moss, Anubias, and Cryptocoryne species. These plants will also offer additional shelter and maintain good water quality. Be mindful of leaving enough open space for your celestial pearl danios to swim and school together.


Celestial Pearl Danios do not require intense lighting in their aquarium. A moderate to low level of lighting is sufficient for their needs. However, providing them with a natural day-night cycle using an aquarium light timer will ensure your fish stay healthy, happy, and active. Keep in mind that live plants in your tank may have different lighting requirements, so be sure to choose plants that can thrive in moderate light conditions.

Feeding and Diet

Types of Food

Celestial Pearl Danios are small omnivores, so they enjoy a varied diet consisting of both plant-based and protein-rich foods. Here are some food options for your fish:

  • Live foods: Baby brine shrimp, daphnia, and micro worms are great choices for providing your fish with live food. Live foods can help mimic their natural feeding habits and encourage hunting behaviors.
  • Frozen foods: If live foods aren’t available, frozen options like brine shrimp, cyclops, and daphnia can be thawed and fed to your fish.
  • Dry foods: Crushed flakes and small pellets, specifically designed for small fish, are suitable options for your Celestial Pearl Danios. High-quality fish food brands will ensure they receive proper nutrition.

Feeding Schedule

To keep your Celestial Pearl Danios happy and healthy, it’s essential to establish a consistent feeding schedule. Feed your fish small portions to prevent overfeeding, which can lead to poor water quality. Here’s a suggested feeding schedule:

  • Young fish: Feed them 3-4 times per day with small amounts of food.
  • Adult fish: Offer food 1-2 times per day, using an amount they can consume in a few minutes.

Remember to remove any uneaten food after feeding to maintain a clean and healthy tank environment.

How to Supplement

Supplementing the diet of your Celestial Pearl Danios is essential for their overall health, color, and vitality. Here are a few ways to supplement their food:

  • Vitamin supplements: Adding liquid vitamins to their food can help ensure they receive all necessary nutrients. Follow the manufacturer’s instructions for dosing and frequency.
  • Vegetable matter: Occasionally offering blanched vegetables, such as spinach or zucchini, can provide additional nutrients and variety in their diet.

Remember to always monitor your fish’s overall health and make adjustments to their diet as needed. With proper feeding and care, your Celestial Pearl Danios will be a vibrant and lively addition to your aquarium.

Behavior and Temperament

Celestial Pearl Danios (CPDs), also known as Galaxy Rasboras, are a peaceful and often timid species. They are an ideal choice for community tanks, as they tend to coexist well with other non-aggressive, small fish. In your tank, you might notice your CPDs swimming in small groups or shoals, which is their natural behavior.

To make your CPDs feel more comfortable and less stressed, provide them with a well-planted tank environment with hiding spots, such as dense plants or rocks. This will give them a sense of security and a space to retreat when necessary.

It’s important to remember that, like all fish, Celestial Pearl Danios have their own personalities and traits, so you might observe some variations in behavior. In general, though, these fish are considered enjoyable and easy to care for, making them a beautiful, low-maintenance addition to your aquarium.

Suitable Tank Mates

Celestial Pearl Danios (CPDs) are peaceful community fish that prefer to be kept with fish of the same species in a group of 6 to 7 individuals. When selecting tank mates for your CPDs, it’s essential to choose peaceful and similarly-sized species that won’t pose a threat to their well-being.

In addition, consider species that occupy the higher parts of the tank, allowing CPDs their own space to thrive. Avoid larger fish, as they may view Celestial Pearls as food, and even large peaceful fish can cause issues over territory and food competition.

Here are some recommended tank mates for CPDs:

  • Tetras (regular, green, and ember)
  • Killifish
  • Cory catfish
  • Molly fish
  • Red cherry shrimp
  • Endler’s livebearer
  • Amano shrimp
  • Honey gourami
  • Sparkling gourami

When selecting tank mates, it’s also important to take their space requirements into account, as larger tanks may be necessary to accommodate all species comfortably. Always research the needs of each species and ensure you have the appropriate tank size and habitat to create a harmonious environment for all your aquatic pets.


Spawning Process

To breed Celestial Pearl Danios, start by preparing a separate breeding tank with a sponge filter and plants. Make sure the water temperature is around 72-79°F, and the pH is between 6.5 to 7.5. After setting up the breeding tank, introduce a group of healthy adult danios and let them settle for a few days. Feed them high-quality food to stimulate breeding.

You’ll notice the danios exhibiting courtship behavior such as chasing and displaying vibrant colors. Once the breeding pairs are established, the males will start to court the females by dancing around them. The females will release their eggs on plants or spawning mops, where the males fertilize them.

Egg Care

After spawning is complete, remove the adult fish to prevent them from eating the eggs. Now it’s time to focus on the egg care. Maintain appropriate water parameters and lighting conditions for the eggs to develop properly. The eggs will be transparent and barely visible, so look closely to monitor their development.

The Celestial Pearl Danio eggs usually take 2-3 days to hatch. During this time, keep the breeding tank clean and ensure the water parameters are stable.

Growing Fry

Once the fry hatch, they’ll be extremely tiny and delicate. Provide them with ample hiding places in the form of plants or mop strands to make them feel secure. For the first week, feed the fry infusoria or freshly hatched brine shrimp. Gradually increase the food size as the fry grows.

Keep monitoring the water quality and perform regular partial water changes to ensure the breeding tank remains clean and healthy. As the fry grows, you can introduce them to microworms or other small live foods.

By following these steps, you’ll successfully breed your Celestial Pearl Danios and enjoy watching the fry grow into beautiful, vibrant fish in your aquarium.

Disease Prevention

Common Illnesses

Celestial Pearl Danios can be affected by several common illnesses, such as:

  • Ich: Also known as white spot disease, characterized by small white spots on their body and fins.
  • Fin Rot: This manifests as fraying and discoloration of the fins, often due to poor water quality.
  • Fungal Infections: They appear as cotton-like growths on your fish’s body.

Preventative Measures

To maintain the health of your Celestial Pearl Danios and prevent these illnesses, follow these tips:

  • Maintain Good Water Quality: Regularly test your aquarium water for ammonia, nitrite, and nitrates, and perform water changes as needed. Make sure to dechlorinate tap water before using it in your tank.
  • Provide a Balanced Diet: Feed your fish a varied diet of quality flakes or pellets, as well as live or frozen food, to ensure they receive all necessary nutrients. Be careful not to overfeed, as it can lead to poor water quality.
  • Create a Stress-Free Environment: Avoid overcrowding your tank and provide hiding spots, such as plants or rocks, to help your fish feel secure. Be cautious when adding new fish or items to the aquarium, as they can introduce disease.
  • Quarantine New Fish: Before introducing new fish to your main tank, place them in a separate quarantine tank for 2-4 weeks to observe them for signs of illness.

Remember, if you notice any symptoms of disease in your Celestial Pearl Danios, consult a professional aquarist or veterinarian for appropriate treatment options. By taking these preventative measures, you’ll be able to create a healthy environment for your fish to thrive in.

Frequently Asked Questions

What is the ideal tank size for Celestial Pearl Danios?

For Celestial Pearl Danios, it is recommended to have at least a 10-gallon tank. However, if you plan to have a school of 10-15 fish, upgrading to a 20-gallon aquarium or larger would be more suitable for their comfort and well-being.

What temperature should their tank be maintained at?

Celestial Pearl Danios thrive in temperatures between 73-79°F (23-26°C). It’s essential to maintain a stable temperature within this range to ensure their health and happiness.

How can you distinguish between male and female Celestial Pearl Danios?

Males usually have more vibrant colors and an elongated, slender body shape. Females tend to have a more rounded shape and display duller colors compared to males. These subtle differences can help you identify their gender.

What is their average lifespan?

With proper care and optimal tank conditions, Celestial Pearl Danios can live up to 3-5 years. Maintaining a clean, stress-free environment and providing a balanced diet will contribute to their longevity.

Do Celestial Pearl Danios require a heater in their tank?

Considering their preferred temperature range is between 73-79°F (23-26°C), a heater may be required depending on the temperature of your room or climate. It’s important to monitor the tank’s temperature and use a heater if needed to keep it within the appropriate range for these fish.