Why Do My Betta Fish Keep Dying? Causes And How To Prevent It

Why do my betta fish keep dying? Why are my pet Bettas dying so often? Why can’t I keep them alive for more than a month or two?

The answer is simple: you’re not doing enough to care for them. But don’t worry, it’s easy to get all the information you need to make sure your Bettas stay healthy and happy.

Why Do My Betta Fish Keep Dying

Bettas are more delicate than other fish, so you need to ensure your tank has proper temperature and water pH level conditions. 

Ensure that you put them in the appropriately sized tank (a 5-gallon tank or larger is ideal) with plenty of decorations and plants to make them feel comfortable. 

You should also change the water regularly (every two weeks) to keep it clean and healthy.

Keep an eye on your fish’s eating habits – they should be fed a diet of both pellets and live food.

Make sure you don’t overfeed them, which can also cause health problems.

Bettas need a lot of oxygen, so make sure you have an air pump in your tank.

Here are 8 reasons why betta fish keep dying:

Poor Water Conditions

One of the main reasons Bettas die in an aquarium is poor water conditions. This can be caused by several things, such as unclean water, high levels of ammonia and nitrite, or incorrect pH levels.

To prevent your Bettas from dying due to poor water conditions, you need to take the necessary steps to keep your tank clean and healthy.

This means changing the water regularly (every two weeks or so), keeping an eye on the pH levels and ammonia and nitrite levels, and not overfeeding your fish.

Why Do My Betta Fish Keep Dying
Image source: flickr.com

You should also make sure you have an air pump in your tank to ensure enough oxygen for your Bettas to breathe.

If you are having trouble keeping your tank clean and healthy, you may consider investing in a water filter.

This will help keep the water conditions in your tank stable and make it easier for you to keep track of the health of your fish.


Stress can be a significant factor in why Bettas die in an aquarium. When placed in an unfamiliar environment or surrounded by other fish that they perceive as a threat, Bettas can become stressed and die.

It is crucial to provide your Betta with a peaceful and relaxing environment, free of stressors. You can do this by keeping only one or two Bettas in an aquarium and choosing fish compatible with Bettas.

You should also avoid overcrowding your aquarium, as this can lead to stress for your fish.

If you notice that your Betta is acting stressed, try adding some plants or decorations to the aquarium to make it more calming.

You can also try adding a bubbler or waterfall to create some movement in the water. If your Betta is still stressed, you may want to consider rehoming them to a more suitable environment.

Improper Diet

One of the most common reasons Bettas die in an aquarium is improper diet. And Bettas are a predatory species and require a high protein diet.

If they are not given a diet that meets their nutritional needs, they can become malnourished and susceptible to disease.

A lack of protein can also lead to swollen bellies, which is a telltale sign that your Betta is not getting the nutrition he needs. In most cases, Bettas will die if they are not given a proper diet.

You can do a few things to ensure that your Betta is getting the proper nutrients. One of the easiest ways is to feed them high-quality fish food.

Bloodworm in aquarium
Image source: flickr.com

You can also supplement their diet with live or frozen food, such as brine shrimp or bloodworms.

It is also essential to make sure that your Betta has access to clean water. Bettas are prone to developing ich if the water quality is poor.

Make sure to test the water regularly and perform water changes as needed.

If you are having trouble keeping your Betta healthy, it is best to consult with a fish specialist. They can help you create a diet that meets your Betta’s nutritional needs and keep him healthy for years to come.

Also read: Crowntail Betta full Care Guide: Tank, Diet

Not Having a Filter in Your Tank

A common reason why Bettas die in an aquarium is a lack of a filter. A filter is important because it helps keep the water clean and prevents the build-up of toxins.

Without a filter, the water can quickly become polluted and dangerous for the fish. If you are keeping Bettas in an aquarium, it is crucial to ensure a filter is in place.

If you don’t have a filter, you may want to consider purchasing one. They are not expensive and can be purchased at most pet stores.

Failure to clean the tank regularly can also lead to the death of Bettas. The build-up of waste products in the water can be toxic to the fish.

It is essential to clean the tank at least once a week to keep the water healthy and safe for the fish. If you are having trouble keeping your Bettas alive, one of these factors likely is to blame.

By ensuring that you have a filter in your tank and by cleaning the tank regularly, you can help to keep your Bettas healthy and alive.

Improper Cleaning Techniques

One of the most common reasons Bettas die in an aquarium is improper cleaning techniques.

This means that people often do not clean their tanks frequently enough, leading to a build-up of harmful toxins in the water.

In addition, many people do not know how to clean a tank, which can also cause problems properly.

Here are some tips on how to properly clean a tank and avoid killing your Betta fish:

Always use a gentle cleaning solution, such as warm water and a mild detergent. Do not use any harsh chemicals or cleaning solutions, as these can be harmful to the fish.

Make sure to clean all of the filters and surfaces in the tank. This will help remove any harmful toxins or bacteria that might be present.

Clean the tank regularly. Depending on the size of the tank, you should clean it at least once a week. If there is a lot of waste or algae build-up, you may need to clean it more often.

Old Age

As fish get older, they become more susceptible to disease and other health problems. This is especially true for Bettas, who can easily die if their water quality or temperature isn’t consistent.

In most cases, the best way to keep your Betta healthy is to keep them in a tank with other fish of a similar size. That way, they will have plenty of room to swim and won’t be as susceptible to stress.

old betta
Image source: flickr.com

If you decide to keep a Betta alone, make sure to change their water regularly and keep the tank clean.

Low water temperatures

One of the most common reasons Bettas die in an aquarium is low water temperatures. Bettas are tropical fish and require water temperatures between 75 and 82 degrees Fahrenheit.

If the water temperature drops below 75 degrees, it can cause the Betta to become lethargic and eventually die. There are a few things that you can do to prevent your Betta from dying due to low water temperatures.

The most obvious is to make sure that the aquarium is kept in a room where the temperature will not drop below 75 degrees.

You can also use a heater to keep the water temperature consistent. If you cannot control the aquarium at a constant temperature, you can also use a thermostat to help regulate the heater.

Tank Size

One of the most important aspects of keeping a Betta fish healthy is making sure that you have a tank of the correct size.

If your tank is too small, your fish will not have enough room to swim, becoming stressed. This can lead to health problems and can even lead to death.

On the other hand, if your tank is too large, your fish will not be able to maintain the right temperature and water quality. This can also lead to health problems and death.

For this reason, it is important to find the Goldilocks zone for your tank size – not too small, not too large, but just right. You can find the right size tank for your Betta fish by using this guide:

5 Gallon Tank – A 5-gallon tank is a good size for a single Betta fish. This will give your fish enough room to swim, but it is still small enough that you can change the water every day.

10 Gallon Tank: A 10-gallon tank is a good size for a school of Betta fish. This will give your fish enough room to swim, and you will only need to change the water every other day.

20 Gallon Tank: A 20-gallon tank is a good size for a community aquarium. This will give your fish enough room to swim, and you will only need to change the water every week.

How Can You Prevent Your Betta Fish From Dying?

It can be heartbreaking to lose a Betta fish, especially if you have put a lot of time and effort into caring for it. Unfortunately, Bettas are delicate and can easily die if not properly cared for.

We will explore why Bettas might die in an aquarium and what you can do to prevent it.

Maintain Good Water Conditions

Keeping a Betta fish healthy in an aquarium requires good water conditions. A common problem that can lead to the death of a Betta is poor water quality.

This can be caused by many factors, such as overcrowding, lack of filtration, and not changing the water often enough. To keep your Betta fish healthy, it is important to maintain good water conditions in your aquarium.

This means changing the water regularly (at least every two weeks), keeping the tank clean, and using a good quality filter. It is also important to not overcrowd the tank, as this can lead to poor water quality.

If you are having trouble keeping your Betta fish alive, it is worth looking at the water conditions in your aquarium. Making some simple changes can help keep your Betta healthy and thriving.

Keep a Clean Tank

It is essential to keep a clean tank if you want your Betta fish to survive. A dirty tank can easily lead to illness and death. Here are some tips on how to keep your tank clean:

Empty the tank and scrub it with a brush every week

Change the water every week

Use a filter to keep the water clean

Feed your fish a balanced diet

Feed Proper Food

It is crucial to ensure that your Betta fish get the right food to keep them healthy and thriving.

Many people mistake feeding their Bettas flakes or other processed foods when they would thrive on a diet of live food.

While it can be more work to feed your fish live food, the benefits are worth it. First of all, processed foods are often not healthy for Bettas and can lead to health problems.

In addition, processed foods often contain artificial colors and flavors, which are harmful to your fish. On the other hand, Live food is packed with nutrients and healthy ingredients that Bettas need to stay healthy.

Minimize Stress

The easiest way to minimize stress is by creating a routine and sticking to it. This includes setting a specific time for work, breaks, and meals and sticking to that schedule closely.

Additionally, avoid letting work bleed into your time and vice versa. Make sure to set aside time each day to relax and de-stress, whether by reading, taking a walk, or watching your favorite show.

When it comes to your aquarium, keep it clean and stocked with healthy fish. Regular water changes and filter maintenance are essential to running your tank smoothly.

If you notice that your Betta is stressed, take measures to calm the tank down. This might include adding more plants, turning off the filter, or reducing the light intensity.


The main things to remember to keep your Betta fish alive are to keep the tank clean, maintain good water conditions, and feed them a healthy diet.

It is also essential to minimize stress as much as possible. If you follow these simple tips, you can help ensure that your Betta fish will live a long and healthy life.

Thank you for reading! We hope this article has helped you learn more about keeping your Betta fish healthy and thriving.

Hey, I am Shuvradeb Biswas a content writer. Fishkeeping is my hobby. There are many problems I faced during my first fishkeeping. So, I made the KeepingWorld.com blog to help new fishkeepers.

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