Rasbora Care: Are Rasboras Easy to Care for?

Rasbora are a highly popular and extremely adorable aquarium fish from the Cyprinidae family.  The crazy thing about the Rasbora is that their genus consists of over eighty different recognized species within.  There are even species outside of the genus that are often considered Rasbora fish, so the term Rasbora refers to a very large group of fish within the hobbyist circles.  Rasbora are native to the freshwaters of Southeast Asia and China areas.  They are normally found in the various bodies of freshwater throughout Malaysia, Singapore, Sumatra, Thailand, as well as many other Asia countries.

Rasbora fish are very peaceful fish that can have a number of potential tank mates including the cory catfish, neon tetras, guppies, cherry barbs, and more.  Since they are small, they tend to stay in their school group and generally do not bother other fish in the tank.

Chili Rasbora
Chili Rasbora

Rasbora Care

Rasbora are extremely easy to take care of as they are small fish that max out around four inches or less.  As long as you have the proper conditions set in your aquarium water with proper filtration, the Rasbora care should be easy.  Following the parameters of this article will help you ensure a happy and healthy life for your Rasbora.

It is important to point out that because there are so many different types of Rasbora fish, it is crucial for you to do a bit of research on any Rasbora fish you plan to get.  Rasbora fish have similar care parameters, however, there are some details that could make a huge difference in the health and happiness of your fish.  Make sure you know exactly what kind of Rasbora you are getting so that you can properly care for them. 

Water Parameters

Popular freshwater fish species recognized for their resilience and simplicity of maintenance are Rasbora fish.  The preferred pH range depends on which type of Rasbora you have.  Types like clown or dwarf Rasbora like a pH level between 4.5 and 7.0, while other Rasbora need more of a neutral pH of 6-7.8.  Therefore, look into the specific type of Rasbora in order to ensure you are setting the correct levels. 

For almost all Rasbora fish, water should be between 72° and 82° Fahrenheit.  Additionally, the Rasbora fish favor water with a general hardness range of 4 to 18 dKH, which is a moderate to high level of hardness.  Rasbora fish also need high-quality water, thus routine water filtration and changes are crucial.  For healthy Rasbora fish, it is also advised to maintain dissolved oxygen levels above 6 ppm.  Following these water parameters will give your Rasbora fish the best environment to thrive in.  Rasbora fish are an excellent addition to any freshwater aquarium because they require little upkeep overall.

Tank Setup

Your tank setup is going to be everything when joining the aquarium hobbyist community.  Depending on the fish you are planning on keeping, you will need to have very specific conditions in order to keep your fish healthy.  With Rasbora fish being so small, you must take into consideration the tank size, flow rate, and how many to keep in one tank together. 

First, plan out how many Rasbora you want to keep and from there, you will be able to determine your tank size.  Rasbora are schooling fish and enjoy groups of at least seven.  However, you need to think about how much space they have to freely swim about.  Are you planning on adding any tank mates to the Rasbora’s environment?  If you are thinking in getting some Rasbora, it would be best to get an aquarium that is at least twenty gallons or more.  You could theoretically keep a couple of Rasbora in a ten-gallon tank, but the truth is that they would be lonely and have limited swim area.  Even the little guy likes his space! 

A Rasbora fish’s lifespan might change based on the species and the environment in which it is kept.

Additionally, Rasbora are used to a slow to moderate flow rate, which is similar to the natural streams and such in the Asia area. 

Rasbora Lifespan

These fish normally live for three to five years in the wild.  However, they can live for up to eight years in captivity with the right care and upkeep.  It is significant to remember that the lifespans of various Rasbora fish species vary.  For instance, the Scissortail Rasbora (Rasboroides osphromenoides) can live up to eight years whereas the Harlequin Rasbora (Trigonostigma heteromorpha) has a life span of about three to five years.

Things like diet, water temperature and quality, and living conditions are just a few examples of the variables that might affect a Rasbora fish’s lifespan.  For these fish to remain healthy and vibrant, proper nutrition, including a diet high in vitamins and minerals, is crucial.  To preserve water quality, the aquarium’s water should be changed on a regular basis and kept at the proper temperature and pH level.  Additionally, it’s crucial to give them a home that includes a lot of swimming room and a group of Rasbora fish.  This will help support general wellbeing and lower stress levels.  Following each of these parameters will greatly enhance your Rasbora’s lifespan up to about eight years.  The more care given to the conditions of the water, filtration, school groups, and such, the more likely your Rasbora care will allow the chance of them living longer.  These lovely and tranquil animals may fill your aquarium with delight and beauty for many years to come with the right care and attention.

The longevity of a particular Rasbora fish species cannot be determined because it depends on the environment in which it is housed.  However, in comparison to smaller species, Rasbora fish species that are greater in size typically have a longer lifespan.  Some of the bigger species, such the Giant Rasbora (Boraras maculatus) and the Scissortail Rasbora (Rasboroides osphromenoides), have been reported to survive up to eight years in captivity when given the right care and attention.

It is significant to remember that a Rasbora fish’s lifespan can also be influenced by factors related to its biology, genetics, and environment.  Therefore, proper Rasbora care is necessary for them to survive.  Before making any choice regarding the fish you want to put in your tank, it is always vital to conduct research and speak with professionals. 

Food and Diet

Since Rasbora fish are omnivores, they consume a wide range of various foods.  They are reported to eat a range of small aquatic invertebrates, including insects, worms, crustaceans, and plankton, in the wild.  They also eat a wide range of plant material, including as moss, algae, and other aquatic plants.  It’s crucial to provide your Rasbora fish a variety diet when they’re maintained in captivity.  Live and frozen delicacies like brine shrimp, daphnia, bloodworms, and other tiny aquatic invertebrates are included in this.  These feeds will give the fish the necessary protein, vitamins, and minerals for growth.

High-quality flake or pellet food should be offered in addition to live and frozen items.  These feeds are particularly created to offer your Rasbora fish all the essential nutrition they require.  They can be fed once or twice daily, but it’s crucial to avoid overfeeding since this can result in bad water quality and health issues for the fish.  Rasbora fish can also be fed vegetable-based diet such blanched spinach, lettuce, or peas.  This can assist in ensuring that their food has a balance of vitamins, minerals, and fiber

It is also crucial to remember that Rasbora fish love to eat in groups because they are schooling fish.

It is better to feed them in a group to encourage them to consume more because they could initially be hesitant and may not eat as much as they should.  In conclusion, proper Rasbora care requires a variety diet in order to stay healthy and happy.  Fresh vegetables and a variety of live, frozen, and dry foods can be fed to fish to give them the critical protein, vitamins, and minerals they require to survive.  To preserve the fish’s utmost health and lifespan, always keep an eye on their eating patterns and make any required adjustments to the feeding schedule and food varieties.


With any pet you decide to keep, the care you provide keeps the pet healthy and happy.  Fish are no different and while they may not require a lot of attention, too much negligence could cost them their lives.  Therefore, it is important to keep an eye on your fish and make sure they are not contracting any kind of disease. (It is a little difficult to hear a fish sneeze.)  Since Rasbora are so widely popular around the world, there are some common diseases that have been found in Rasbora that you should be aware of and know a bit of what to do if you spot these diseases forming.

Here are common diseases that affect rasboras:

White Spot Disease

Ich, sometimes referred to as white spot illness, is one common ailment that affects Rasbora fish.  Ich is brought on by the parasite Ichthyophthirius multifiliis, which adheres to the fish’s skin and causes the development of tiny white spots.  In order to prevent the disease from spreading to other fish in the aquarium, it is vital to isolate any sick fish. These spots can be treated with a number of anti-parasitic drugs, such as copper sulfate or formalin.


The illness known as Columnaris, which is brought on by the bacterium Flavobacterium columnare, is another one that can harm Rasbora fish.  This condition can result in secondary infections, ragged fins, and ulcers.  Antibiotics can be used to treat columnaris, but to stop the illness from returning, water quality must be kept high.


Another illness that can afflict Rasbora fish is bloat.  It results from a bacterial infection that builds up fluid inside the fish’s body.  This might make the fish appear bloated and make it difficult for them to breathe and swim.  Antibiotics can be used to cure bloat, but it’s also critical to find and treat any underlying reasons, such as bad water or overfeeding.

Mouth Fungus

Another illness that can harm Rasbora fish is mouth fungus.  It is brought on by a fungus and manifests as white, cottony growths on the fish’s mouth.  Antifungal drugs can be used to treat mouth fungus, but maintaining a clean aquarium and adequate water quality is essential to stop the disease from returning.

Fin and Tail Rot

Fin and tail rot is a prevalent, curable bacterial disease brought on by unclean water.  The tissues in the fish’s fins and tail deteriorate from the edge to the base as a result of this illness.  Lethargy, discoloration of the fin or tail, and wear and tear on a portion of the fin or tail are all symptoms of fin and tail rot.  By periodically changing the water and sweeping out the debris, adding aquarium salt to the water, and using antibiotics like Amoxicillin, you can treat this sickness.

Anchor Worms

The Rasbora fish might suffer a great deal from anchor worms and perhaps die as a result.  They are tiny parasitic worms that adhere to fish and feed on the blood of the fish.  As soon as you notice anchor worms on your Rasbora, you should treat them.  Rasboras frequently experience problems with anchor worms.  The best technique to treat anchor worms is to use a medication that contains the active chemical levamisole, while there are other methods as well.

Other Causes of Rasbora Dying

There are other major causes that could lead to your Rasbora getting sick or worse.  Ideally, the healthier you keep your fish tank and its conditions, the longer life your Rasbora has a chance to live.  However, like with most fish, you also stay consistent with your care. 

Water Logged

For example, the water is something that you will need to monitor on a regular basis.  It would be very beneficial for you to keep a log of your water conditions including the pH level, temperature, and water changes.  Updating a log will help you keep track of everything that the tank is experiencing.  If some aspect of the water is not working, then you can use the log to influence your decisions for change.  If you are just starting out in Rasbora care, you may need to do more research and/or consult professionals.  Therefore, being able to provide the log’s information will help solve any issues that might cause problems for your fish.


Additionally, do not overfeed your Rasbora.  Rasbora are very small fish and do not require a lot of food.   Some fish will simply stop eating when they are full, however, other fish will eat too much to the point of it affecting their health.  Generally speaking, you should only give your Rasbora fish enough food that they can finish in a few minutes.  This is another reason to keep a log.  You can use the log to create a feeding schedule and monitor the Rasbora feeding habits.  It will help you keep track of all the food that your Rasbora prefer, how much of it they eat, and how often you give each type of food to the Rasbora.  This will be extremely useful information to have if there are ever any issues with your Rasbora care.  A final note about food: make sure that you clean any uneaten food out of the tank water.  This will also include anything that gets stuck in any plants or substrate at the bottom of the tank.

No Salty Waters

It is crucial to remember that Rasbora fish are extremely salt sensitive and need a low or no-salt environment to thrive.  Sodium chloride, usually known as salt, is frequently added to aquariums to help manage bacteria and parasites.  Rasbora fish, on the other hand, are not tolerant of high salt concentrations and will quickly get stressed out and even die if exposed to it.  Rasbora fish can develop something called osmotic stress, which can harm their gills and make breathing difficult, as well as other health issues.  Furthermore, excessive salt intake might harm their kidneys and other internal organs, creating major health issues.  Therefore, it is best not to add any salt to the water.  It is essential to use a salt-free water conditioner when keeping Rasbora fish.  Make sure to read the label of any products that you are using.  There are also many professionals and avenues of research that will help you make the best decisions.  Additionally, it is crucial to utilize dechlorinated water that is devoid of salt when doing a water change. Rasbora fish require a low or no-salt environment to survive so make sure you remove any and all traces of it.  When doing water changes, it’s crucial to stay away from salt-containing items and to use dechlorinated water that is salt-free.  Rasbora fish can have a healthy and happy life in your aquarium by being given the necessary conditions and care.

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