The Ultimate Guide to the Celestial Pearl Danio (Galaxy Rasbora)

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Fishkeeping can be a daunting and challenging task, especially when keeping exotic fish like Celestial Pearl Danios.

These fish are known for being delicate and hard to care for, but you can easily keep them happy and healthy in your home aquarium with the correct information.

By reading this article, you’ll learn everything you need to know about keeping Celestial Pearl Danios in your aquarium.

We’ll provide you with all the information on their size, diet, compatibility with other fish, and more!

Celestial Pearl Danio An Overview

If you’re a beginner fishkeeper, then the Celestial Pearl Danios or CPD’s might be the perfect choice for your first aquarium.

With their small size and delicate nature, these colorful fish are easy to care for and highly entertaining.

Origin – Where Are They From?

The Celestial Pearl Danio is a freshwater fish from Southeast Asia. It naturally inhabits ponds, streams, and the shallow backwaters of larger rivers.

They are often found in densely vegetated areas with submerged vegetation or roots.

What Does A Celestial Pearl Danio Look Like?

These fish feature a bright orange body with either black stripes or spots on it, while their fins are also primarily orange with some white markings on them.

Their tail fin is long and split, while their caudal fins are somewhat lacy in appearance.

As juveniles, they display a bright red color in their tail fin.

How Big Do They Get?

The Celestial Pearl Danio will grow to a max size of 2.4 inches / 6 cm in length.

Growth Rate: When cared for properly, a Celestial Pearl Danio will grow to full size in about one year.

How Long Will They Live?

The lifespan of a Celestial Pearl Danio is around three years.

How To Care For Celestial Pearl Danio: The Basic Tank Requirements

In this next section, we’ll explain some of the basic tank requirements you’ll need to know when caring for the Celestial Pearl Danio.

Tank Size

The minimum tank size you’ll need to house a Celestial Pearl Danio is 10 gallons / 40 liters.

However, we recommend using a tank size of at least 20 gallons / 80 liters for best results.

Temperature & Ideal Water Parameters

So what are the ideal temperature range and water parameters for Celestial Pearl Danio?

Well, it all depends on where you live. If you live in a hot environment (above 85° F), you’ll need to keep your tank at around 75-80° F.

If not, then a more appropriate range would be 70-75°F.

The same applies to the pH levels of your tank; they should be somewhere between 6.0 and 7.5 if possible!

Ideally, these fish prefer soft water conditions since they’re from Southeast Asia, which has softer water.


Since the Celestial Pearl Danio is a delicate fish, it’s essential to have a good filtration system in your aquarium to keep the water clean and healthy.

A sponge filter or air-powered filter would be ideal for this purpose, as they are both gentle and effective at cleaning the water.

Make sure to change the filter media regularly (every 2-4 weeks) to ensure that your fish are constantly swimming in clean water.


A heater is a must-have for any aquarium, especially if you’re keeping tropical fish like the Celestial Pearl Danio.

The best type of heater to use for this purpose is an adjustable aquarium heater. This type of heater can be easily set to the desired temperature, and it will automatically maintain that temperature without having to worry about it.

Make sure to place your heater in a well-lit area of your tank, as this will help keep the water temperature stable.

Substrate and Decor

When it comes to substrate and decorations for your Celestial Pearl Danio, always keep in mind their delicate nature.

Therefore, it’s best to use a soft substrate like sand or gravel and avoid using any sharp objects ornaments.

Some good choices for substrate and decor would be:

  • Sand or gravel
  • Driftwood
  • Live plants

Live Plants

When it comes to living plants, a few are ideal for CPDs.

One of the best plants for this fish is Anubias.

This plant is hardy and does well in low-light conditions. It also doesn’t require much maintenance, making it an excellent choice for busy aquarists.

Another good option is Java moss.

This plant is easy to care for and grows well in many environments. It also won’t tax your lighting system, making it a pretty low-maintenance plant to have in the aquarium.

Java fern is another good choice for Celestial Pearl Danios.

This plant has rhizomes that attach themselves to rocks and driftwood, giving them a secure place to grow.

Diet Requirements and Feeding

The diet for a Celestial Pearl Danio should consist of various foods, including both meaty and plant-based foods.

Some good options for meaty foods would be:

  • Bloodworms
  • Daphnia
  • Mealworms
  • Mosquito larvae
  • Tubifex Worms
  • White worms

Some good options for plant-based foods would be:

  • Algae wafers
  • Brine shrimp pellets
  • Cucumber
  • Zucchini
  • Lettuce
  • Spinach

How often do you feed Celestial Pearl Danio?

How often you feed a Celestial Pearl Danio will depend on the type and size of food you’re providing them.

If you’re feeding them small, meaty foods like bloodworms, you can feed them once or twice a day. However, if you’re feeding them larger items like zucchini, you’ll only need to feed them once every day.

We recommend feeding your CPDs 2-3 times per day as a general rule.


The most common diseases that will infect Celestial Pearl Danios are

  • fin and tail rot,
  • ichthyophthirius (ich),
  • and bacterial infections.

Poor water conditions usually cause fin and tail rot.

Therefore, make sure to keep an eye on your fish, do regular water changes (at least 20% every 2-4 weeks), and make sure that the tank’s temperature is stable (~75° F).

If you notice any damage to their fins or tails, it’s a good idea to treat the tank with Melafix or Pimafix.

These remedies are natural and help prevent infection.

If your CPDs start showing signs of ich (tiny white dots on the body), make sure to immediately do a 30% water change and treat with medicine like Quick Cure or Super Ich.

Both of these medications are effective at eliminating the infection.

If your fish starts showing signs of a bacterial infection, you’ll need to increase the water temperature to 86° F and use antibiotics like Melafix or Pimafix.

These treatments will help your fish get better faster, so you mustn’t miss out on any doses.

Temperament and Tank Mates

The Celestial Pearl Danio is a peaceful fish that does well when kept in schools of six or more.

They are active and playful and will make a great addition to any home aquarium.

Some Good Tank Mates For Your Celestial Pearl Danio

1. Other Danios – Celestial Pearl Danios get along well with other danios, so it’s a good idea to add some to your tank.

2. Tetras – Tetras are small fish that make a great addition to any aquarium, and they don’t bother celestial pearl danio.

3. Guppies – Guppies are also small fish, and they come in lots of different colors, which will make your aquarium look more vibrant.

4. Cory Catfish – Cory catfish are bottom feeders that will help keep the tank clean, and they won’t harm the celestial pearl danio.

5. Barbs – Barbs are another type of fish that is compatible with celestial pearl danios, and they come

Breeding Celestial Pearl Danio: Overview Of A Successful Breeding Scenario

Breeding Celestial Pearl Danio is an exciting process.

They will do something called “spawning rituals.” When these rituals happen, the males and females chase each other until they release eggs & sperm into the water.

The female will lay the eggs on the leaves of plants, and if there are no plants in your aquarium, it is recommended to have spawning mops ready.

The eggs will hatch in about 48 hours.

After they are hatched, the fry may need live baby brine shrimp until they are big enough to eat flake foods; you can feed them crushed flakes.


If you’re looking for a peaceful and active fish to add to your home aquarium, the Celestial Pearl Danio is an excellent option.

These fish are easy to care for and come in schools of six or more.

They do well when kept with other Danios, Tetras, Guppies, Cory Catfish, and Barbs.

Breeding them is an exciting process and can succeed if you have the right supplies ready.

Related: 17 Popular Aquarium Fish Ideas


How Many Celestial Pearl Danios Can I Put In My Tank?

You can put anywhere from 1-8 Celestial Pearl Danios in your tank, depending on the size of your tank and how much space you have.

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