Why Is My Betta Fish Swimming Sideways?

If you’re noticing that your betta fish is swimming sideways, it could be a sign of a health problem. In this blog post, we’ll explore some of the possible causes and what you can do to help your fish feel better.

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Reasons for Betta Fish Swimming Sideways

There are a few reasons your betta fish may be swimming sideways. One reason may be that its swim bladder is damaged. This can be caused by constipation, infection, or injury. Another possibility is that your fish is experiencing stress from its environment. too much light or noise, for example, can lead to stress in fish.

Infectious Disease

One of the most common reasons for a betta fish to swim sideways is an infection. Bettas are very susceptible to infections, and they can often develop one even if they seem perfectly healthy. The most common symptom of an infection is a betta fish swimming sideways, but other symptoms can include lethargy, loss of appetite, and difficulty breathing. If you think your betta fish may have an infection, take them to the vet immediately.


One of the most common reasons a Betta fish will swim sideways is because of an injury. If your fish has been bumping into objects or otherwise seems to be swimming erratically, he may have injured himself. Check your fish carefully for any signs of injury, such as redness, swelling, or cuts. If you see anything that looks concerning, take your fish to the vet for an evaluation and treatment.


One of the most common reasons that a betta fish will swim sideways is stress. Betta fish are very sensitive to their environment and can easily be stressed by changes in water temperature or quality, a new tankmate, or even a loud noise. If your betta fish is swimming sideways, you should check to see if there have been any changes in its environment that could be causing stress. You can also try moving your betta fish to a smaller tank or placing it in a quiet room to see if this helps reduce stress levels.

Swimming in a Small Tank

One potential reason your betta fish is swimming sideways is that the tank is too small. Betta fish need at least 2.5 gallons, and prefer tanks that are 5 gallons or larger. If your tank is too small, your fish may be experiencing stress, which can lead to swim bladder disease.

How to Treat a Betta Fish Swimming Sideways

Betta fish are a type of freshwater fish that is known for its beautiful fins and colors. Bettas are also known to be very active and playful fish. However, sometimes you may notice your betta fish swimming sideways. This can be a sign of a few different things. Let’s take a look at a few of the possible causes and how to treat them.


You may have to quarantine your betta fish if it is swimming sideways. This means keeping your fish in a separate tank from other fish. Quarantine tanks are usually small, so you will need to get a smaller tank for your fish. You can also use a different bowl or jar.

You should also change the water in the quarantine tank every day. You can use a siphon to remove the water. You will need to add fresh, clean water to the tank each day.

You may also need to add an air bubbler to the quarantine tank. This will help keep the water oxygenated and help your fish breathe.

Clean the Tank

One of the most common reasons a betta fish would swim sideways is because the tank is not clean enough. Betta fish are very sensitive to their surroundings and need a clean tank in order to stay healthy.

There are a few things you can do to make sure your tank is clean enough for your betta fish:

-Do a partial water change every week. This means taking out about 30% of the water in the tank and replacing it with fresh, clean water.

-Clean the gravel in the bottom of the tank. You can do this by vacuuming it with a special gravel vacuum or by scooping it out and rinsing it in a bucket of clean water.

-Clean any decorations in the tank. This includes things like plants, rocks, and driftwood. You can do this by removing them from the tank and scrubbing them with a soft brush.

Change the Water

If your betta fish is swimming sideways, the first thing you should do is a water change. Ammonia and nitrites can build up in a fish tank quickly, and these toxins can cause your fish to become ill. A water change will remove these toxins from the water and help your fish to recover.

Give the Betta Fish a Stress-Free Environment

A betta fish that is sick or stressed may start to swim sideways. To help a betta fish feel better, start by making sure its environment is as stress-free as possible. Betta fish are territorial and sometimes aggressive, so they need to be in a tank by themselves. The tank should also have plenty of hiding places, like plants or rocks, for the fish to feel safe. The water should be clean and the temperature should be between 76 and 82 degrees Fahrenheit.

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