
Micro Rasboras are a delicate and fascinating species, and with proper care, they can thrive in a well-maintained aquarium.
They are a schooling fish, so they need to be kept in a group of at least six individuals to feel secure.
Their natural habitat is in slow-moving streams and rivers, so they prefer water with low currents and plenty of hiding places.
A well-planted aquarium with plenty of hiding places is ideal for Micro Rasboras, as it allows them to feel secure and reduces stress.
They are omnivores, which means they eat both plant and animal matter, and can be fed a varied diet of high-quality flake food and live or frozen foods.
Micro Rasboras are relatively small, growing up to 1-2 inches in length, so they require a small aquarium with plenty of space to swim.
In the wild, they are found in small schools in the slow-moving waters of Thailand and Indonesia.
They are a peaceful species and do well in community tanks with other peaceful fish.
Take a look at this: Rasboras Fish
Habitat and Environment
Rasboras are found throughout south and southeast Asia, including southeast China, and prefer shallow water and abundant aquatic plant growth.
Their natural habitats are gently flowing forest streams, but they also occur in floodplains during the wet season.
The water is often stained brown from tannins released by leaves and other organic matter, and the pH can be as low as 4.0 in some habitats.
Light is often subdued due to overhanging vegetation.
In the wild, rasboras prefer a pH of 5.0 to 7.0 and KH between 1° and 3° (20 ppm to 50 ppm).
If you're keeping a micro rasbora in an aquarium, the pH should be between 6.8 and 7.8, and alkalinity between 3° and 8° dkH (50 ppm to 140 ppm).
Remember to maintain good filtration and change 10% of the water weekly or 25% twice a month to keep your micro rasbora happy and healthy.
For another approach, see: Rasbora Heteromorpha Care
What Do Rasboras Eat?
Rasboras are micro-predators, which means they feed on small insects and tiny crustaceans in nature.
In the aquarium, they thrive on Aqueon Tropical Flakes and Color Flakes. They also love Tropical Granules and Shrimp Pellets.
For small species, it's essential to crush dried foods to match their mouth size. This ensures they can easily eat and digest their food.
Frozen and live foods can be fed as treats or to help induce spawning. This is a great way to provide a varied diet and stimulate their natural behavior.
To keep your rasboras healthy, rotate their diet daily and only feed what they can consume in 2 to 3 minutes, once or twice a day. This will help prevent overfeeding and keep their water clean.
Behavior and Compatibility
Micro rasboras are social creatures that thrive in groups. They're active and love to explore their surroundings, making them perfect for community tanks with other small, peaceful species.
In fact, they're known to be quite timid and may be intimidated by larger or more boisterous tankmates. However, having similarly-sized, surface-dwelling species in the tank can help reduce their shyness.
To bring out their best colors and natural behavior, it's recommended to keep a group of at least 8-10 micro rasboras together. This will not only make them less nervous but also create a more effective and natural-looking display.
Little Gems

Rasboras are a great choice for small aquariums because they're peaceful and colorful, and most species grow to less than 4 inches.
They're active and hardy, making them perfect for beginners, and they're great in 10-gallon aquariums or larger.
Rasboras are best kept in groups of 7 or more, but if you want to see them really thrive, try a group of 25 or more - it's a sight to behold!
Smaller species like dwarf emerald rasboras and Boraras are ideal for even smaller aquariums, like desktop and nano tanks, and they max out at just 1 inch or less.
These tiny rasboras are perfect for showcasing their brilliant colors in a small space.
Expand your knowledge: Small Rasboras
Behavior and Compatibility
Micro Rasbora Galaxies are active and social creatures that thrive in groups, making them excellent candidates for community tanks with other small, non-aggressive species.
They are known for their peaceful demeanor, but their small size can make them vulnerable to intimidation or outcompeting for food by larger tankmates.

To reduce their shyness, it's recommended to keep them with similarly-sized, surface-dwelling species.
A group of at least 8-10 specimens is ideal, as this will not only make the fish less nervous but also result in a more effective, natural-looking display.
Males will display their best colours and interesting behaviour as they compete with each other for female attention.
This species is very peaceful but doesn't make an ideal community fish due to its small size and timid nature.
It will do best when maintained alone or with other diminutive species such as Microdevario, Sundadanio, and small Loricariids.
Rasboras are generally peaceful and can be housed with similarly sized community fish, but some species may be better suited for a species tank.
For example, dwarf rasboras like those in the genus Boraras are best kept in a species tank due to their small size.
Suggestion: Torpedo Barbs Fish
Appearance and Characteristics
These tiny fish are truly a marvel of nature. Typically reaching an adult size of only 1.5 centimeters (0.6 inches), the Micro Rasbora Galaxy is a diminutive yet striking sight to behold.
Their iridescent blue-green body is adorned with a horizontal black stripe that extends from the nose to the base of the tail fin, making them a true gem in the aquarium world. A splash of bright orange or red near the caudal fin adds an extra pop of color, making them a standout in any aquarium.
The Dwarf Rasbora, a similar species, is also known for its striking beauty. It features a strikingly beautiful nano fish that is very popular among aquarists due to its schooling behavior, peaceful disposition, and very small size.
Appearance
The Micro Rasbora Galaxy is indeed a tiny fish, typically reaching an adult size of only 1.5 centimeters (0.6 inches). Its small stature is quite remarkable considering its mesmerizing beauty.
These tiny fish feature a striking iridescent blue-green body. The contrasting coloration is what makes them truly stand out.
A horizontal black stripe extends from the nose to the base of the tail fin, adding to their unique appearance. This black stripe is a defining characteristic of the Micro Rasbora Galaxy.
A splash of bright orange or red near the caudal fin adds a pop of color, making them a true gem in the aquarium world.
Explore further: Galaxy Rasbora / Celestial Pearl Danio
Boraras Maculatus
Boraras Maculatus is a strikingly beautiful nano fish that's very popular among aquarists. It's known for its schooling behavior, peaceful disposition, and very small size.
This fish is typically found in schools of 6 or more, with larger schools of 20+ being more ideal. In fact, its schooling behavior is fascinating, especially in very large schools.
The Dwarf Rasbora (Boraras maculatus) is distinctive in its spotting and bright ruby coloration that males often display. This coloration is a sign of optimal diet and care.
Here are some recommended tank parameters for Boraras Maculatus:
- Temperature: 68 - 82.4° F (20°-28° C)
- pH: 4.0 - 7.0, acidic water is preferred
- KH: 3 - 12 dKH
- Minimum Tank Size: 5 gallons
Boraras Maculatus is safe to keep with other peaceful, small fish, and even dwarf shrimp. It's also a good idea to keep it with larger, peaceful invertebrates.
Maximum Standard Length
When it comes to appearance, one of the most striking features of this fish is its standard length. Maximum Standard Length is 10 – 13 mm.
These fish are quite small, which makes them a great choice for smaller aquariums. They can thrive in densely-planted aquariums and are an excellent choice for carefully-aquascaped set-ups.
Adding some floating plants and driftwood roots or branches to the tank can really make a difference in their comfort level.
Species and Classification
Micro rasboras are a fascinating group of fish, and understanding their species and classification can help you appreciate them even more.
They belong to the family Cyprinidae, which is a large and diverse group of fish that also includes carps and minnows.
Micro rasboras are typically classified as part of the genus Boraras, which is a relatively small group of fish within the Cyprinidae family.
Some species of micro rasboras, like the Boraras urophthalmoides, are found in the wild in Southeast Asia, while others are bred in captivity for the aquarium trade.
These tiny fish are relatively new to the aquarium hobby, with some species only being described in the 1990s.
Etymology
The name Boraras micros is a clever combination of words that reveal its unique characteristics.
The genus Boraras is an anagram of the generic name Rasbora, which is a nod to the reversed ratio of abdominal and caudal vertebrae in this genus. This distinct feature sets Boraras apart from other species.
Boraras micros is also known for its small size, which is reflected in its name. The species' diminutive adult size is a result of its name, which comes from the Ancient Greek word μικρός (mikrós), meaning 'small'.
Classification
Classification is a crucial step in understanding the diversity of life on Earth. It's a way to group living things based on their characteristics and evolutionary relationships.
The Linnaean system is a widely used method of classification that organizes living things into a hierarchical structure, from kingdom to species. This system was developed by Carolus Linnaeus in the 18th century.
There are five kingdoms in the Linnaean system: Animalia, Plantae, Fungi, Protista, and Monera. Each kingdom represents a distinct group of organisms with similar characteristics.
A species is a group of living organisms that can interbreed and produce fertile offspring. This concept is key to understanding classification.
Care and Maintenance
To keep your Micro Rasboras happy and healthy, you'll want to set up a tank that mimics their natural habitat. A tank size of at least 20 liters (5 gallons) is recommended, as this will give them plenty of room to swim and thrive.
Related reading: Harlequin Rasboras Tank Size
Maintaining stable water parameters is crucial. The ideal water temperature for Micro Rasboras is between 22-28°C (72-82°F), and a pH level of 6.0-7.5 is preferred.
Regular water changes are also essential, with a goal of changing 10-20% of the water every week. This will help keep the water clean and prevent any water quality issues.
Here's a quick rundown of the ideal water conditions for your Micro Rasboras:
Rasboras Housing Needs
Rasboras are happiest in a well-planted aquarium and they do best in groups of 7 or more.
To create a natural environment, provide a dark substrate and a gentle filter that simulates the slow-moving streams they live in. A secure lid is also essential to prevent them from jumping out.
A well-decorated aquarium with plenty of hiding spots will help reduce stress and bring out their vibrant colors.
Here are some key housing requirements for Rasboras:
By following these housing requirements, you can create a happy and healthy environment for your Rasboras.
Water Conditions

Water Conditions are crucial for the health and well-being of your fish. To create a suitable environment, you'll want to maintain a pH level between 6.0 and 8.0, as recommended in Example 2.
The ideal pH range for most aquarium species is between 6.8 and 7.8, with an alkalinity of 3° to 8° dkH (50 ppm to 140 ppm), as stated in Example 1. If you're keeping wild-caught fish, you'll want to aim for a pH of 5.0 to 7.0 and KH between 1° and 3° (20 ppm to 50 ppm), also mentioned in Example 1.
The hardness of the water should be between 54 and 268 ppm, as specified in Example 2. For a more precise guide, refer to Example 3, which suggests a hardness range of 36 to 179 ppm.
To keep your aquarium water clean and healthy, perform regular water changes of 10-20% every week, as advised in Example 4.
Reproduction and Growth
This species is an egg-scattering, continuous spawner that exhibits zero parental care, so it's possible that small numbers of fry may start to appear without intervention.
To increase the yield of fry, a slightly more controlled approach is required, such as using small, dimly lit containers with a pH of 6.0-7.0 and a temperature towards the upper end of the suggested range.
The adults will eat their eggs, but they don't actively hunt for them, so you can still get a decent number of fry.
Two or three pairs of well-conditioned adult fish should be introduced to each container, and they should begin to spawn the following morning.
The first eggs should hatch by the second day after the initial spawning, and the tiny young will survive on their yolk sacs for another 24 hours or so.
After a week to ten days, the fry should be large enough to accept Paramecium or other microscopic food.
It's best to wait a week or two before starting to perform small water changes to avoid unduly shocking the young fish.
Frequently Asked Questions
How many rasboras are in a 5 gallon?
For a 5-gallon tank, 10-15 chili rasboras is a recommended minimum for a healthy shoal, but overstocking can be managed with proper filtration and plants.
Featured Images: pexels.com


