|Scientific Name||Danio Margaritatus|
|Common Name||Celestial Pearl Danio, Galaxy Rasbora, Firework Rasbora|
|Origin||South East Asia, Myanmar|
|Water Parameters||pH is between 6.5 and 7.5, dGH 1-5|
|Adult Size||up to 1 inch|
|Diet||Omnivorous, mostly herbivorous|
Table of Contents
Celestial Pearl Danio Facts
- Discovered in 2006, it is important to note that there is still much to be discovered about their habitat and species. Being discovered in 2006 means that new discoveries about this species are likely.
- While they were only recently discovered, color variants have already been identified.
- This species was originally called Celestichthys margaritatus, which translates as “heavenly fish adorned with pearls.” They were later reclassified and renamed Danio margaritatus.
- Although considered a peaceful fish, the males will fight. This sometimes causes injury and death.
Celestial Pearl Danios (Danio Margaritatus) are a newly discovered freshwater fish species, and there is much to learn about this fish. Aquarium hobbyists admire them worldwide for their vibrant color and active nature. They are often referred to as Galaxy Rasboras or Firework Rasboras. However, these little fish are more closely related to Danios than they are to Rasboras.
These fish are often categorized as nano-schooling fish. However, they do prefer to live in a relatively large group. Therefore, a species-specific tank may be suitable if you intend to keep them in a small aquarium. The females move around in groups through the territory of the males. The males will follow along after the females while aggressively competing with other males. They have proportionately larger eyes than other fish of this type, and they also sport smaller gills in relation to their body size.
They have white, pearl-like spots along their bodies and red coloration along their fins. Due to their distinctive markings, it makes it possible to tell the male Celestial Pearl Danios from the females. The males tend to have brighter fins and more deep red in color than the females. The males also have a more blue tone when compared to the females. The females have a more green tone to their bodies. Males are thinner and have a more deep, rich color. The females are duller in color and have a more rounded shape.
Celestial Pearl Danio Care
Celestial Pearl Danios are described as opportunistic feeders with a varied diet. In their natural habitat, Celestial Pearl Danios sticks mostly to the bottom, feeding on many species of plants, algae, and zooplankton. They have also been observed eating small invertebrates and worms. In an aquarium setup, they will eat dry flakes and pellets as long as they are small enough to fit in their mouths.
A good option for feeding the Celestial Pearl Danio is to use live or frozen food such as brine shrimp or krill. Feeding them krill will help bring out the vibrant red coloration.
They are timid feeders that mostly stick to the bottom of the tank. They will not venture out of their hiding places to eat if they are too scared. Observing them during feeding time is important to ensure they are eating. It is also a good idea to give them a variety of foods rather than sticking to one type of fish food. This will keep them healthy and vibrant.
Size and Lifespan
The Celestial Pearl Danio can grow from 0.75 inches to 1 inch in length at full maturity. They have an average lifespan of 3 to 5 years with proper care.
Tank Size Requirement
Celestial Pearl Danios have a minimum tank requirement of 10 gallons. 5 or 6 individuals can be kept in a tank this size, consisting mostly of females. Adding an additional 2 gallons to the tank for every additional fish added to the aquarium is recommended.
A 20-gallon long tank that is planted heavily with a wide variety of vegetation and dark substrate is recommended. Many plants should be added to make them feel safe. Rocks and driftwood can also be added to mimic their natural environment. The specific type of plant doesn’t necessarily matter as long as it provides shade and cover. Bushy plants are also a great addition to their tank for spawning.
In a planted tank setup, bright lighting is beneficial. The light helps the plants thrive, which provides the fish with places to hide and lay their eggs. The more plants and places to hide their tank, the more likely they will feel secure enough to be out in the open.
In the wild, Celestial Pearl Danios prefer weedy and slow-moving streams with lots of places to hide. The hiding places become more important with the addition of more males to the tank.
It is important to note that they also like shallow water. The shallow and calm water in the aquarium would closely mimic their natural environment and help make them feel more at ease.
5 or 6 Celestial Pearl Danios in a tank is recommended as the minimum number in your tank, with more emphasis on females than males. This significantly lowers the risk of fighting between the males, as they spend most of their time courting females. Celestial Pearl Danios live in groups in their natural habitat, and keeping them in a group will keep your fish healthy and active. Introducing more of them into your tank should be easy as long as you keep the tank capacity and the female-to-male ratio in mind.
Celestial Pearl Danios require a temperature range of 71-78°F. Properly monitoring the temperature of your aquarium is always a good idea, as well as regular water changes.
Tank mates for Celestial Pearl Danio easy to find since they are generally peaceful fish.
Potential tank mates include other peaceful fish of similar size such as neon tetras, cardinal tetras, cherry shrimp, killifish, corydoras, Mollys, and guppies.
Since they are timid fish, it is important to properly set up their tank with plenty of hiding places especially if other tank mates are to be considered.
Celestial Pearl Danio Breeding
Celestial Pearl Danio fish can be bred if you keep some of their behaviors and preferences in mind. A tank setup that closely mimics their natural environment is important for getting the Celestial Pearl Danio to breed.
The females are egg layers; the ones ready to spawn become darker in color and have a more rounded abdomen. Female Celestial Pearl Danio fish can spawn almost daily, laying a few eggs simultaneously. They can lay up to 30 eggs, but it is more likely to get them in groups of roughly a dozen. The female could lay them anywhere in the tank, but she prefers an area with more still water. In many cases, live food is used to stimulate the spawning process. The eggs will incubate for 2 to 4 days before they enter their larval stage and begin to swim.
If you plan on breeding these little beauties, you will want to add something to their tank to protect their eggs or place them in a separate tank altogether. The Celestial Pearl Danio eats its own eggs, with the males constantly seeking them out. Even with males eating their own eggs, a few of the fry may eventually make it to maturity and join the group.
Courting males change in color as well. They gain a deeper red coloration on their abdominal region when they are around females ready to spawn. Since males are competing with each other constantly, it is important for them to have many places to hide. Most of the males’ time is spent courting females, leading to males showing aggression toward each other.
An easy way to see if your Celestial Pearl Danios are fighting is simply by observing their body. A fish that has been fighting will have torn fins and other signs, such as bite marks on their sides. High levels of aggression could be dangerous since damaged fins and body can lead to sickness and death. Especially in a setup with lots of males, it is common to see many torn fins. The dominant male could be the only one without damage.
The key to maintaining a healthy level of competition among males is to keep the correct ratio of males to females. A proper tank size with plenty of hiding places will help as well.