Rasboras Care 101: Tank Setup, Diet, Tank Mates, Diseases & More!

If you’re looking for a colorful and easy-to-care-for fish, Rasboras are a great option to consider. These small freshwater fish are native to Southeast Asia and come in a variety of vibrant colors and patterns. In this article, I’ll cover everything you need to know about caring for Rasboras, from their species summary to tank setup, water quality, diet, and more.

Rasboras are popular aquarium fish due to their small size, peaceful temperament, and vibrant coloration. They require a tank of at least 10 gallons with a temperature range of 72-82°F, pH range of 6.0-7.5, and a varied diet of commercial flakes, pellets, and live or frozen foods. They are generally peaceful and can be kept with other small, non-aggressive fish.

One of the biggest advantages of keeping Rasboras is their lifespan, which can range from 3 to 5 years with proper care. These fish are also relatively small, typically growing to only 2-3 inches in length. Their peaceful nature and active behavior make them a great addition to community tanks. When it comes to tank setup, Rasboras prefer a planted aquarium with plenty of hiding spots and open swimming areas. They also require a heater to maintain a consistent water temperature of 75-82°F.

Overall, Rasboras are a low-maintenance fish that are perfect for beginners and experienced hobbyists alike. With their striking colors, peaceful temperament, and easy care requirements, they are sure to be a standout addition to any aquarium. Keep reading to learn more about how to care for these fascinating fish!

Rasboras care 2

Species Summary


Rasboras are a type of freshwater fish that originate from Southeast Asia, specifically from the rivers and streams of Thailand, Indonesia, and Malaysia.


On average, rasboras can live for around 3-5 years in captivity.

However, with proper care and a healthy environment, they can live up to 7 years.


Rasboras are small, colorful fish that come in a variety of hues, including red, orange, blue, and green.

They have a slender body shape and a forked tail. Their eyes are large, and they have a distinct black spot at the base of their tail.


Rasboras are small fish, typically growing to be around 1-2 inches in length.

Growth Rate

Rasboras have a relatively slow growth rate, taking around 6-12 months to reach their full size.

Behavior & Temperament

Rasboras are peaceful and social fish that thrive in groups.

They are active swimmers and enjoy exploring their environment.

They are also known for their playful behavior and can often be seen darting around their tank.

Male vs Female

Male and female rasboras are generally similar in appearance, but males tend to be slightly smaller and more colorful than females.

During breeding season, males may also develop a brighter coloration to attract females.

Tank Setup

Tank Size

When it comes to rasboras, a larger tank is always better. At a minimum, a 20-gallon tank is recommended for a small school of these fish.

However, if you want to keep a larger group or pair them with other fish, you’ll need to go bigger. A 40-gallon tank or larger is ideal for a community of rasboras.


Rasboras don’t have any specific lighting needs, but it’s important to provide them with a consistent day/night cycle.

A timer can help regulate the lighting and ensure that your fish get the right amount of light each day.

Filtration & Aeration

Good filtration is crucial for a healthy rasbora tank.

A hang-on-back filter or canister filter is recommended, and you’ll want to aim for a turnover rate of at least 5-6 times the tank volume per hour.

Aeration is also important to keep the water oxygenated and healthy for your fish.


Rasboras are tropical fish and require a consistent water temperature of around 75-80°F.

A heater is necessary to maintain this temperature, and a thermometer will help you monitor it.


Rasboras prefer a soft substrate, such as sand or fine gravel. Avoid sharp or rough substrates that could damage their delicate fins.


Decorations can provide hiding places for your rasboras and create a more natural-looking environment.

Driftwood, rocks, and caves are all good options.

Just be sure to avoid any decorations with sharp edges that could harm your fish.


Live plants are a great addition to a rasbora tank, as they provide oxygen and help maintain water quality.

Java fern, anubias, and hornwort are all good choices that don’t require high light or CO2 injection.

Water Quality

Ensuring proper water quality is essential for the health and well-being of your rasboras. Here are some important factors to consider:

Water Temperature

Rasboras are tropical fish and require a consistent water temperature between 75-82°F (24-28°C).

Fluctuations in temperature can cause stress and weaken their immune system, making them more susceptible to diseases.

Water pH

Rasboras prefer slightly acidic water with a pH range of 6.0-7.0.

It’s important to monitor pH levels regularly, as fluctuations can cause stress and even death in extreme cases.

Water Hardness

Rasboras prefer soft to moderately hard water with a hardness range of 5-12 dGH.

Hard water can cause stress and weaken their immune system, making them more susceptible to diseases.

Water Changes

Regular water changes are crucial for maintaining good water quality.

Aim to change 25-50% of the water in your tank every 1-2 weeks. This will help remove any excess waste and toxins that can build up over time.

By keeping a close eye on water temperature, pH, and hardness, and performing regular water changes, you can help ensure a healthy and thriving environment for your rasboras.

Personally, I’ve found that maintaining consistent water quality has made a huge difference in the overall health and happiness of my rasboras.

By taking the time to monitor and adjust these important factors, you can help your fish thrive and enjoy a long and healthy life.

Tank Maintenance

Maintaining a healthy tank for your rasboras is crucial for their well-being. Here are some tips for keeping your tank clean and healthy:

  1. Clean the tank regularly: Regular water changes are essential for the health of your rasboras. Aim to change 20-30% of the water in your tank every week. This will help to remove excess waste and toxins from the water, keeping your fish healthy.
  2. Test the water: Regularly test the water in your tank for pH, hardness, and other parameters. This will help you to identify any issues with the water quality and take action before it affects your fish.
  3. Keep the filter clean: Your tank’s filter is responsible for removing waste and debris from the water. Make sure to clean the filter regularly to keep it functioning properly.
  4. Check the temperature: Your rasboras are sensitive to changes in temperature, so it’s important to keep the water at a consistent temperature. Use a thermometer to monitor the temperature and adjust the heater as needed.
  5. Monitor your fish: Keep an eye on your rasboras for any signs of illness or stress. If you notice any issues, take action immediately to prevent the problem from getting worse.
  6. Keep the tank free of debris: Regularly remove any debris or uneaten food from the tank. This will help to prevent the buildup of harmful bacteria and keep the water clean and clear.

By following these tips, you can help to ensure that your rasboras stay healthy and happy in their tank.

Personal Anecdote: I’ve found that maintaining a healthy tank for my rasboras is not only important for their well-being, but it also brings me joy and satisfaction as a fish owner. Watching my fish thrive in their clean and healthy environment is truly rewarding.

Tank Mates

Compatible Fish Species

When it comes to choosing tank mates for your rasboras, it is important to consider their peaceful temperament.

They get along well with other peaceful fish that share their water requirements. Some of the best tank mates for rasboras include:

  • Tetras
  • Guppies
  • Corydoras
  • Otocinclus Catfish
  • Cherry Shrimp

These species are all peaceful and can coexist with rasboras without any issues.

They also share similar water requirements, making it easy to maintain a healthy environment for all the fish in your tank.

Incompatible Fish Species

While rasboras are peaceful fish, there are some species that they are not compatible with. These include:

  • Cichlids
  • Angelfish
  • Betta Fish
  • Gouramis

These species are known for their aggressive behavior and may harm or stress out your rasboras. It is best to avoid keeping them in the same tank.

Personally, I have had success keeping rasboras with tetras and corydoras in my own tank. They all get along well and create a peaceful and harmonious environment. However, it is important to always monitor your fish and their behavior to ensure they are all getting along and thriving.

Keeping Rasboras Together: How Many Is Ideal?

As someone who has kept Rasboras for years, I can tell you that these fish are social creatures and prefer to live in groups.

In fact, keeping them alone can lead to stress and even death. But how many should you keep together?

The ideal number of Rasboras to keep together depends on the species and the size of your tank.

In general, a group of at least six Rasboras is recommended, but some species, such as the Harlequin Rasbora, prefer larger groups of 10-15 individuals.

Keeping too few Rasboras can lead to aggression and stress, while keeping too many can lead to overcrowding and poor water quality.

When deciding how many Rasboras to keep, it’s important to consider the size of your tank. A larger tank can accommodate more fish, while a smaller tank may only be able to support a smaller group.

As a general rule, you should have at least one gallon of water per inch of fish in your tank.

Another factor to consider is the behavior and temperament of your Rasboras. Some species, such as the Chili Rasbora, are more aggressive than others and may require more space or a smaller group.

On the other hand, some species, such as the Lambchop Rasbora, are more peaceful and can be kept in larger groups.

Overall, the key to keeping Rasboras happy and healthy is to provide them with a suitable environment and a group of their own kind.

By keeping the right number of Rasboras together, you can create a thriving community that will bring you joy for years to come.


Proper diet is essential for the health and well-being of your rasboras.

In this section, we’ll cover what to feed your rasboras, how often to feed them, and some tips to ensure they’re getting the nutrition they need.

What To Feed

Rasboras are omnivores, which means they eat both plants and animals.

A balanced diet for your rasboras should include a variety of foods, such as:

  • High-quality flake or pellet food
  • Frozen or live foods, such as brine shrimp, bloodworms, or daphnia
  • Veggies, such as blanched spinach or zucchini

It’s important to note that while rasboras will eat most types of food, they have small mouths and can’t handle large or hard foods.

Make sure to break up any large pellets or chunks of food before feeding them to your rasboras.


Rasboras should be fed small amounts of food 2-3 times a day. Overfeeding can lead to health problems, so it’s important to only give them what they can eat in a few minutes.

If there is leftover food, remove it from the tank to prevent it from polluting the water.


Here are some tips to keep in mind when feeding your rasboras:

  • Rotate their diet to ensure they’re getting a variety of nutrients
  • Feed them at the same time every day to establish a routine
  • Use a feeding ring to prevent food from floating away and to ensure all rasboras get their fair share
  • Don’t forget to fast your rasboras once a week to give their digestive system a break

By following these tips and providing a balanced diet, your rasboras will be healthy, happy, and full of energy.

Common Diseases


Rasboras are generally hardy fish, but they can still be susceptible to diseases. Some common diseases that affect rasboras include ich, velvet, and fin rot.

Ich is a parasitic disease that causes white spots on the fish’s body and fins.

Velvet is another parasitic disease that causes a yellowish-brown velvet-like coating on the fish’s body. Fin rot is a bacterial disease that causes the fins to become ragged and frayed.


Symptoms of these diseases can include lethargy, loss of appetite, rapid breathing, and abnormal swimming behavior.

In the case of ich, white spots on the body and fins are a telltale sign. Velvet can be identified by the yellowish-brown coating on the fish’s body. Fin rot can be identified by the ragged and frayed fins.


The best way to treat these diseases is to catch them early. If you notice any symptoms, it’s important to act quickly. There are a variety of treatments available, including medication and water changes.

For ich and velvet, medications such as copper sulfate or malachite green can be effective. For fin rot, antibiotics may be necessary.

It’s important to follow the instructions on the medication carefully and to continue treatment until the disease is completely gone.


Prevention is key when it comes to keeping your rasboras healthy. Maintaining good water quality is essential.

Regular water changes and proper filtration can help prevent the buildup of harmful bacteria and parasites. It’s also important to quarantine any new fish before adding them to your tank to prevent the introduction of diseases.

Finally, feeding your fish a healthy diet and providing them with a stress-free environment can help keep them healthy and prevent diseases.

I’ve personally had experience with ich in my rasbora tank. It was a stressful time, but with quick action and the right treatment, we were able to save the fish and prevent the spread of the disease.

It’s important to keep a close eye on your fish and take action at the first sign of any symptoms.

Signs of a Healthy Rasbora Fish

Rasboras care

As a rasbora owner, it’s important to be able to identify signs of a healthy fish. Here are some indicators to look out for:

  1. Active swimming: A healthy rasbora will be active and swim around the tank regularly. They should not be lethargic or spend most of their time hiding.
  2. Good appetite: A healthy rasbora will have a good appetite and eagerly eat their food. If you notice your fish is not eating or appears to be losing weight, it could be a sign of illness.
  3. Bright colors: Rasboras are known for their vibrant colors, and a healthy fish will have bright and clear colors. Faded or dull colors could indicate poor health or stress.
  4. Clean fins and scales: A healthy rasbora will have clean and intact fins and scales. Check for any signs of damage or discoloration, which could be a sign of disease.
  5. Clear eyes: The eyes of a healthy rasbora will be clear and not clouded or swollen. If you notice any abnormalities in their eyes, it’s best to seek veterinary care.
  6. Normal breathing: A healthy rasbora will breathe normally and not gasp for air at the surface of the water. If you notice any difficulty breathing, it could be a sign of poor water quality or disease.

Remember, even if your rasbora appears healthy, it’s important to maintain a clean and stable environment to prevent any potential health issues.

Regular water changes and proper tank maintenance can go a long way in keeping your fish healthy and happy.

Personally, I always keep a close eye on my rasboras and make sure to check for any signs of illness or stress. One time, I noticed that one of my rasboras was not swimming as actively as usual and appeared to be losing weight. I immediately took action and treated the tank for parasites, which ended up saving the fish’s life. It’s important to be vigilant and proactive when it comes to your fish’s health!

Signs of a Sick Rasbora Fish

When it comes to keeping your rasboras healthy, it’s important to be aware of the signs of illness. Here are some common symptoms to look out for:

  1. Changes in behavior: If your rasbora is suddenly hiding more than usual or seems lethargic, it could be a sign that something is wrong. Keep an eye on their swimming patterns and see if they’re acting differently than normal.
  2. Loss of appetite: If your rasbora isn’t eating like they used to, it could be a sign of illness. Try offering different types of food to see if they’re just being picky, but if they still won’t eat, it’s time to investigate further.
  3. Physical changes: Look for any changes in your rasbora’s appearance, such as discoloration, lesions, or bloating. These could be signs of disease or infection.
  4. Gasping for air: Rasboras are freshwater fish, so if you notice your fish gasping for air at the surface of the water, it could be a sign that the water isn’t properly oxygenated or that there’s a problem with the filtration system.
  5. Erratic swimming: If your rasbora is swimming erratically or seems to be having trouble maintaining their balance, it could be a sign of illness or injury. Remember, the best way to keep your rasboras healthy is to maintain a clean and well-maintained tank.

Regular water changes, proper filtration and aeration, and a healthy diet can go a long way in preventing illness. If you do notice any of these symptoms, it’s important to act quickly to diagnose and treat the problem.

I remember when my own rasbora started showing signs of illness. At first, I wasn’t sure what was wrong, but after doing some research and consulting with a veterinarian, I was able to get to the root of the problem and provide the necessary treatment.

It can be scary when your fish aren’t feeling well, but with the right care and attention, they can recover and thrive once again.


Breeding rasboras can be a rewarding experience for fish keepers. However, it requires some preparation and attention to detail. In this section, we will cover the breeding setup, how to breed rasboras, and care for the fry.

Breeding Setup

To breed rasboras, you will need a separate breeding tank. The tank should be at least 10 gallons in size and have a sponge filter or air stone for aeration.

The water temperature should be around 78°F, and the pH should be between 6.5-7.5. You can add a breeding mop or a clump of Java moss to the tank as a spawning site.

Rasboras are egg scatterers, so they will lay their eggs on the mop or moss.

How To Breed

To breed rasboras, you will need a breeding pair. You can identify a breeding pair by looking for the female’s rounder belly and the male’s more vibrant coloration.

Once you have a breeding pair, you can introduce them to the breeding tank. The rasboras will spawn in the morning, and the female will lay her eggs on the breeding mop or moss.

After spawning, you should remove the parents from the breeding tank to prevent them from eating the eggs.


After the eggs have hatched, the fry will need to be fed small amounts of infusoria or liquid fry food several times a day.

As they grow, you can gradually introduce larger foods like baby brine shrimp. It’s essential to keep the water quality in the breeding tank high to ensure the fry’s health.

You should perform daily water changes of 10-20% and monitor the water temperature and pH. In my experience breeding rasboras, I found that patience and attention to detail are key.

It may take some time for the rasboras to spawn, and caring for the fry requires consistent effort. However, seeing the fry grow and develop into healthy adult fish is incredibly rewarding.

Product recommendations for rasboras:

  1. Hikari Micro Pellets – These pellets are specially formulated for small fish like rasboras, and will provide them with the essential nutrients they need.
  2. TetraMin Plus Tropical Flakes – These flakes are a great option for feeding your rasboras, as they are high in protein and other important nutrients.
  3. API Stress Coat Water Conditioner – This water conditioner will help to reduce stress in your aquarium, which can be especially important for sensitive fish like rasboras.
  4. Seachem Flourish Excel – This liquid fertilizer is a great way to promote healthy plant growth in your aquarium, which can be beneficial for rasboras.
  5. AquaClear Power Filter – This power filter is a great way to keep your aquarium water clean and clear, which is important for the health of your rasboras.
  6. Eheim Jager Aquarium Thermostat Heater – A heater is essential for maintaining a consistent water temperature in your aquarium, which is important for the health of your rasboras.
  7. API Master Test Kit – This test kit is a great way to monitor the levels of ammonia, nitrite, and nitrate in your aquarium, which can help you keep your rasboras healthy.
  8. Fluval Plant and Shrimp Stratum – This substrate is a great option for planted aquariums, and can help to promote healthy plant growth, which can be beneficial for rasboras.
  9. Hydor Koralia Nano Aquarium Circulation Pump – A circulation pump can help to keep the water in your aquarium moving, which can be important for the health of your rasboras.


Overall, rasboras are a wonderful addition to any aquarium. They are easy to care for and come in a variety of colors and sizes.

Their peaceful nature makes them great tank mates for other non-aggressive fish species.

When setting up a tank for rasboras, it is important to provide them with a suitable environment that mimics their natural habitat.

This includes a properly sized tank, appropriate lighting, filtration and aeration, and a variety of decorations and plants.

Water quality is also crucial for the health and well-being of rasboras.

Maintaining the proper temperature, pH level, and water hardness, as well as performing regular water changes, will help ensure a healthy and thriving aquarium.

Feeding rasboras a varied diet of high-quality foods is important to keep them healthy and happy. It is also important to be aware of common diseases that can affect rasboras and take steps to prevent and treat them.

Finally, breeding rasboras can be a rewarding experience for experienced aquarists. With the right setup and care, rasboras can breed successfully in a home aquarium.

Personally, I have found rasboras to be a joy to keep in my own aquarium. Their active and peaceful nature is a pleasure to watch, and their vibrant colors add a beautiful touch to any tank. With proper care and attention, rasboras can thrive in any aquarium and bring years of enjoyment to their owners.


Here are some frequently asked questions about Rasboras:

Q: What is the lifespan of Rasboras?

A: Rasboras have a lifespan of around 3-5 years in captivity if they are properly cared for.

Q: What size tank do I need for Rasboras?

A: A minimum tank size of 20 gallons is recommended for a small school of Rasboras, but a larger tank of 40 gallons or more is preferred for a larger school or community tank.

Q: Can Rasboras be kept with other fish?

A: Yes, Rasboras are generally peaceful and can be kept with other peaceful fish such as tetras, gouramis, and corydoras. However, avoid keeping them with aggressive or nippy fish such as barbs or bettas.

Q: What should I feed my Rasboras?

A: Rasboras are omnivores and will eat a variety of foods including flakes, pellets, frozen and live foods. A varied diet is important for their health and wellbeing.

Q: How often should I do water changes for my Rasboras?

A: It is recommended to do weekly water changes of around 25% to maintain good water quality for your Rasboras.

Q: How do I know if my Rasboras are sick?

A: Look out for signs such as lethargy, loss of appetite, abnormal swimming behavior, or physical symptoms such as discoloration or fin rot. If you suspect your Rasboras are sick, seek advice from a veterinarian or a knowledgeable fish store employee.

Q: Can I breed Rasboras in my home aquarium?

A: Yes, Rasboras can be bred in a home aquarium. However, breeding can be challenging and requires specific conditions such as a separate breeding tank, the right water parameters, and the right diet.

Q: Do Rasboras jump out of the tank?

A: Yes, Rasboras are known to be jumpers, so it is important to have a secure lid on your tank to prevent them from jumping out.

Overall, Rasboras are a great addition to any community aquarium and are relatively easy to care for. With proper care and attention, they can thrive and live a long and healthy life in your home aquarium.

Reference: Wikipedia.


Hi there! My name is Jacob, and I'm the founder of this Pet people blog that talks all about aquarium and fishkeeping. I've been passionate about fish and aquatic life since I was a kid, and I've spent countless hours learning about different species, their habitats, and how to create the perfect environment for them to thrive in.

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