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Celestial Pearl Danio/Galaxy Rasbora: Everything You Need To Know

The celestial pearl danios are a stunning freshwater species that make your aquarium vibrant. Any aquarist looking to add a pop of color to their tank should consider them because they combine beauty and simple maintenance needs.

Despite being a popular choice for small aquariums, they are more adaptable than many people realize. Dive to learn everything you need about caring for Celestial Pearl Danios from this guideline, their breeding, diet and food, tank mates, and other things.

Celestial Pearl Danio

Celestial Pearl Danio Facts & Overview

Celestial Pearl Danio
Celestial Pearl Danio
  • Binomial name: Danio margaritatus
  • Other names: Galaxy rasbora and fireworks rasbora
  • Commonly located in: Northern Thailand, Myanmar, Lake Inle (eastwards)
  • Lifespan: 3 to 5 years Size: 0.75 to 1 inch
  • Color: a deep blue with yellow or white spots with a pattern that resembles the galaxy, deep orange or red fins
  • Diet: omnivore
  • Behavior: calm
  • Lowest tank size: ten gallons
  • Temperature: 71 to 78 Fahrenheit Ph: 6.5 to 7.5
  • Hardness: one to five (Dgh)
  • Breeding: laying eggs
  • Compatibility: expert community, community
  • Lighting: no unique needs


The world was first introduced to the newly found freshwater fish, the Celestial Pearl Danio in 2006. They were initially discovered in Myanmar, living in little ponds.


Celestial pearl danios are found naturally in freshwater ponds covered by grassland and rice paddies. The Salween River basin region of the Shan plateau in Myanmar is a common location for these fish.


There are many pet stores where you can buy celestial pearl danios. Typically shoals of five to ten fish are sold per container. The price goes from about $9.99 to $69.99 for a single one and a shoal of ten respectively. You can purchase them online from Arizona aquatic gardens, flip aquatics, and aqua imports.


Actinopterygii is a group of organisms that includes celestial pearl danios. Bony and ray-finned fish belong to this group. These characteristics are well-known for pearl danios.


The average Celestial Pearl Danio lives between three and five years when confined under ideal circumstances. A few factors can affect how long they live; stress and unclean water are the major ones.


Celestial Pearl Danios measure approximately one inch long.
Celestial Pearl Danios measure approximately one inch long.

When fully grown, Celestial Pearl Danios measure approximately one inch long. At about three months, when they reach puberty, most fish will get a size comparable to this. The main difference between males and females in their habitat and the aquarium is that females are typically more extensive and robust.

Their growing popularity as eye-catching aquarium fishes is due to their small size and vibrant color. The fact that so many visual details are packed into a tiny body has always struck them as impressive.


Once they have reached their full size, celestial pearl danio typically weighs about 0.2 pounds or 3.5 ounces. The fish in this species is light due to their small size. It is yet another factor contributing to their prominence as tank fish.

Conservation status

Celestial Pearl danios have significantly decreased in population and have become rare due to increased demand for them when trading pets. Since breeders and collectors are only permitted to amass a small number, their cost to the industry has also increased.

Swimming pace

The speed at which this fish can swim is unknown. But because they typically live in swift-moving lakes, streams, and rivers, they are agile swimmers.

Appearance & Behavior Appearance

The galaxy-like structure that results from this gives rise to their name.
Celestial Pearl Danios exhibit sex dimorphism

When Celestial Pearl Danios were first discovered, their appearance was what initially captured the attention of the aquarium community. These fish are stunning in every way and despite being colorful, they have a surreal aesthetic. These fish are deep blue at their core. Their bodies, however, are covered in spots that resemble pearls.

The galaxy-like structure that results from this gives rise to their name. An intense red or orange color appears on the fins. Compared to the rest of their bodies, the vivid color creates a stunning contrast. Its belly is the same color as the rest. Their fins are pretty pronounced compared to the shape and size of their bodies. The fish’s body’s lower third is dominated by a tall dorsal fin that protrudes like a vibrant sail.

Additionally, two pelvic fins and a large anal fin are visible, two black lines are slicing through each fin. The fins have a very distinctive appearance, thanks to certain transparent parts. Celestial Pearl Danios exhibit sex dimorphism, which implies that males and females have different physical characteristics.

Expert Tip: Although the distinctions are few being aware of them can be very beneficial. Males are typically slimmer than females.

In contrast to the females’ plump shapes, their bodies have a narrower profile. Additionally, the male colors are more vivid. Instead of the striking red hues that the males have, females typically have mildly duller orange tones.


The majority of the time, Celestial Pearl Danios are calm fish. They frequently form groups, and they are often exploring the tank. Celestial Pearls are not shoaling fish, despite what is widely believed. They enjoy spending time together but also like to separate and pursue their interests.

Once they become familiar with their surroundings, they frequently live apart. The likelihood of a fight is the only aspect of temperament you need to be concerned about.
You must avoid putting more male celestial pearl danios in one tank as they are likely to fight each other.

There will always be a conflict between males over females. Severe harm or death could result from this. We recommend having more females in the tank, even though males typically have a higher level of vibrancy. In turn, this can lessen rivalry and prevent most conflicts from arising.

Celestial Pearl Danio Care & Tank Requirements

Celestial Pearl Danio Care & Tank Requirements


Care for Celestial Pearl Danios is simple. Anyone with basic aquarium skills can look after them because they are moderately hardy. It’s crucial to give these fish the proper surroundings. They are vulnerable to stress and may exhibit symptoms of failing health if things aren’t done correctly.

The first step is ensuring that these fish live long and contented lives and ensuring their habitat has all they require. Sometimes owners neglect the small details, which undermines their later attempts to provide proper care.

Tank requirements

The size of the tank

The Celestial Pearl Danios require at least a tank size of ten gallons.
The Celestial Pearl Danios require at least a tank size of ten gallons.

The Celestial Pearl Danios require at least a tank size of ten gallons because they only grow to a length of about an inch. The assumption is that you’re housing about five or six of them together.

The general rule that many aquarists follow with this species is approximately two gallons for each fish to make things simple. It gives them space to move around freely while swimming and find hiding spots without being crammed close together.

Amount of water

The ideal way to take care of Celestial Pearl Danios is to replicate their natural habitat. These fish can be discovered in shallow ponds that are swarming with vegetation in the wild. The result is very pure and clear water. These ponds are also deficient in minerals and salts because of the foliage.

Try to keep this in mind, and do your best to abide by the rules. Doing this will maintain their health and put less strain on their body. We strongly advise purchasing a quality water test kit. The first step in monitoring and adjusting your aquarium is to obtain precise readings.

For Celestial Pearl Danios. the following water characteristics are advised:

  • The ph. level of six and a half to seven and half
  • Water temperatures of about 73 to 79 Fahrenheit
  • Water hardness of about two to ten degrees of carbonate hardness(Dkh)

Things to put in their tank

Huge plants' leaves are also frequently used for breeding purposes.
Huge plants’ leaves are also frequently used for Celestial Pearls breeding

Celestial Pearl Danios have gained popularity among those who enjoy aqua scaping due to their love of plants. This unusual art form uses many plants to create sensational surroundings. These setups are ideal for Celestial Pearls, and your fish will be comfortable because the plants provide hiding places.

Huge plants’ leaves are also frequently used for breeding purposes. They will have a more incredible feeling of plants, and the males will have a good hiding place when they begin vying for female attention. Any well-known plants should do just fine because you can be flexible in this regard. Driftwood and rocks work well too.

The fish should be relaxed and at ease as long as they have a few natural hiding places. You have a few different substrate options to choose from.

Expert Tip: Galaxy Rasboras prefer to hang out in the aquarium’s lower half and aren’t known for digging. You should pick a substrate compatible with the plants you intend to use.

Due to its versatility, fine dark sand is a good preference, plus it is also simple to clean and beneficial to plants. For Celestial Pearls to remain healthy, appropriate filtration is essential. Robust filtration is necessary because these fish do not withstand pollutants quite well.

A common hang-on back or canister sieve, like the Fluval fX4, can be used. Just be sure to pack sponges into any inlet tubes. Air bladders or powerful pumps are not required. Celestial Pearl Danios favor pond-like environments with slow water flow rates.

Nitrogen cycle

The nitrogen cycle in your tank managed appropriately managed and observed to ensure the well-being of all fish, such as Celestial Pearl Danios. The ecosystem in which fish live is harmed when the water’s toxins, which are made up of nitrite, ammonia, and a lesser amount of nitrate, are allowed to rise above a certain threshold.

Their immune system is subsequently weakened. As a result, increasing the risk of countless illnesses and. in the worst cases, even death. Therefore, you ought to avoid putting these fish in a tank that hasn’t finished cycling fully.

To preserve ideal water conditions, you must also regularly monitor your nitrate, ammonia, and nitrite levels and ensure to partly change your water each three to four weeks once. To protect the Danios, you should perform these water changes more frequently if your tank is tinnier.

Common Potential Illnesses

Celestial Pearl Danios is still the subject of numerous ongoing investigations. Fortunately, researchers and aquarists have not discovered new illnesses specific to these fish. They are prone to other widespread diseases. Celestial Pearl Danios are particularly susceptible to fin rot. Examining the fin’s edges will help you recognize this ailment.

Fragile and discolored tissue will develop over time, and the fin may lose some of its structural parts. There are a few factors that contribute to this disease. First, it might be a direct result of the bad water. You can prevent it by consistently checking the temperature and ph. They are using a dependable testing kit to check the water levels.

Fin rot has also been linked to fighting. The likelihood of developing the disease increases when the fins are damaged. However, fin rot is simple to treat using the right equipment. The first step would be to restore the water to its ideal state.

Use antibacterial medicines exclusively designed for this condition. The fins can regrow and regain their original appearance with the proper care.

Celestial Pearl Danio Tank Mates

Celestial Pearl Fish of the same species are the best for danios.
Celestial Pearl Fish of the same species are the best for danios.

Celestial Pearl Fish of the same species are the best for danios. We recommend having six to seven fish in one tank; they thrive with peaceful fish of a similar size and species. Getting noticeably larger tank mates is the main thing you should avoid. Celestial Pearls may appear to large fish as food.

Therefore, stick to species that are the same size. Even large peaceful fish can cause trouble. Doing this can avoid hostility and competition due to food.

Expert Tip: Tank mates you can consider for this fish include killifish, molly fish, red cherry shrimp, Amano shrimp, guppies, honey gourami, Endler’s livebearer, cory catfish, the green, ember, and regular tetras.

You should avoid keeping them in the same tank as tiger barbs, jack Dempsey, cichlids, betta fish, and Buenos Aires tetras.

Diet and Feeding

They are omnivores fish and don’t have particular food preferences in the wild. As a result, their diets can vary greatly. These fish typically eat plants and algae. They enjoy eating plankton as a snack when they are out in the wild. Additionally, they might consume tiny vertebrae as a protein source.

The fish will thrive in captivity on commonly available pellets or flakes. Ensure that it is of top quality and offers a balanced meal. Consider purchasing sinking pellets as another option.

You must ensure that the food reaches Galaxy Rasboras because they spend most of their time at the bottom of the aquarium. When you feed the fish, oversee them and observe their habits.

Avoid overfeeding them or filling their tank with the food they won’t eat since the water quality can be quickly ruined in this way. Choosing something they can eat is one of the challenging aspects of getting the right food. You’ll need to spend money on tiny pellets the fish can readily consume because they have comparatively little mouths.

With protein-packed snacks and live foods, you can improve their diets. Good options include live daphnia, krill, grindal worms, and brine shrimp.


The process of breeding is simple for this fish. They do not breed in any particular season. Many aquarists advise giving your fish a lot of live food to encourage breeding. Celestial Pearl Danios lay eggs.

In the aquarium, females look for areas with little water flow. It happens most frequently near plants. She can produce up to 30 eggs at once and are tiny in size. You must check them regularly so you can quickly locate them.

It is because males will immediately eat the eggs upon discovering them. When all the eggs have been laid, you ought to carefully remove them from the primary tank and place them in the spawning one. The eggs will spend two to four days incubating once they are secure in the spawning tank. The small fry will then hatch.

To maintain their health, you can give them micro foods. The fry will eat the plants if you have an existing tank with lots of vegetation. You can switch to tiny worms, flakes, and young brine shrimp as they age. By three months or so the fish should be fully mature.

Should You Get a Celestial Pearl Danio for Your Aquarium?

Should You Get a Celestial Pearl Danio for Your Aquarium
Should You Get a Celestial Pearl Danio for Your Aquarium?

With its red-fin and galaxy-like body pattern, the celestial pearl danio is a simple and lovely inclusion to aquariums. The fact that so many visual details are packed into a tiny body has always struck them as impressive. They give a very textured, difficult-to-describe effect as they swim around.

Expert Tip: A celestial pearl danio is an excellent addition to a communal aquarium with other peaceful, small fish species. These fish aren’t good for your tank if the aquarium already has massive or violent fish life.

Celestial Pearl Danios

As we all know, each animal has its habitat that makes them survive and continue living its life ahead of it. Animals tend to be territorial for them to be able to live longer and stay- as a human person, we should be considerate and responsible for taking care of them by giving them the appropriate shelter for their existence.

This way of giving them the right protection that suits them could create an everlasting life to live and be free from their top. Animals are just like human beings. We tend to have shelter to live in and free ourselves from harm the community might cause us.

This article gives such an understanding of people’s queries about such concerns. In this part, we should answer the question of how many celestial pearl danios should be together? The answer is it needs to have 6 to 7 fish together in the area to continue their breeding and safety.

Are Celestial Pearl Danios Good for Beginners?

Are Celestial Pearl Danios Good for Beginners?
Are Celestial Pearl Danios Good for Beginners?

Celestial pearl danios are a great choice for beginners. They’re highly sought after specifically because of that, in fact. Once they reach sexual maturity, which only takes a few months, they’ll try to breed almost daily, which is a plus for any novice.

If you want them to successfully breed, though, be sure to appropriately care for them during that time. Other than breeding tendencies, these colorful little critters are generally easy to care for anyway. They’re not particularly picky about food, so you don’t need to worry about a super-carefully curated diet just for them.

Since they tend to be on the shy side, you shouldn’t have to worry about them being any trouble for other breeds of fish in your tank. On the flip-side, if you intend to only keep these fish in your tank, you’ll notice they get along with each other quite well, as they prefer to stay in small schools.

Overall, they’re fairly low-maintenance fish with an impressive output. They’re a safe choice for any beginner.

How big do Pearl Danios get?

A freshwater fish belonging to the danio family is called a celestial pearl danio. These fish have bodies that are dark blue with white or yellow spots that resemble galaxies. Celestial pearl danios reach an adult length of 3/4 to 1 inch.

Celestial pearl danios are both lively and calm. Because of their gentle disposition and distinctive pattern, they are popular among aquarists. Although heavenly pearl danios are reasonably simple to care for, they are easily agitated, which leads to illness. As a result, avoid exposing them to stress.

These fish like to hide behind rocks and plants in their native environment, so make sure tanks have enough vegetation. Because these fish are omnivores, they should be fed a mix of pellets, dry fish flakes, and live invertebrates or freeze-dried.

Celestial pearl danios are a simple and attractive addition to any aquarium, thanks to their galaxy-patterned bodies and bright red fins.


The Celestial Pearl Danio has many positive attributes and adds a special kind of beauty to any freshwater aquarium. We strongly advise getting this fish if you’re thinking about it. They are a lot of fun to watch and can be cared for by owners of all levels of experience.

The care of these fish is straightforward as long as you follow the instructions in this article. Feel free to ask any pending questions about the Celestial Pearl Diano in the comment section below.

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