Why Do My Betta Fish’s Fins Look Ripped?

by Britt
Photo credit: MEDIAIMAG / Shutterstock.com

Have you noticed a ragged or torn fin on your betta fish? Don’t panic! Ripped fins often look bad, but they are a common struggle betta fish keepers face.

This guide will explore the potential causes of betta fin damage, from environmental stress to rough tank mates. I’ll also share treatment options to help your betta look and feel great again and preventative measures to reduce the risk of future problems.

Why Do My Betta Fish’s Fins Look Torn?

There are several reasons you may notice damage to a betta fish’s fins, all of which require your prompt attention. An actual tear, split, or bite is the result of a physical injury. However, one other condition is often confused with a tear – fin rot.

This condition results from poor water quality and excess stress levels, weakening the fish’s immune system. It’s commonly seen in bettas that are adopted from a pet store setting due to the small containers they are kept in and the overstimulating environment. The most significant visual difference between fin rot and a torn fin is the presence of black, brown, red, or white edges to the fin. You may also see small fuzzy growths or white spots on the fin.

If you suspect your fish is suffering from fin rot, you will need to act quickly, as the condition becomes more difficult to treat the more it progresses. This includes quarantining the fish if they are in a community tank, cleaning the tank to prevent further problems, careful maintenance of the hospital tank, and the use of medication for more severe cases.

4 Common Causes of Torn Fins

Fin damage or tears result from physical damage. However, this damage could have occurred from several different causes. The first step in helping your betta recover is to identify what happened. Here are a few of the most common causes of torn fins in betta fish:

Tank Decorations

Take a moment to look at the decorations in your betta’s tank or aquarium. Run your fingers along the edge and feel for sharp or rough surfaces. Items like fake plants, decorative sculptures, rocks, and driftwood can snag your fish’s delicate fins as they brush against it while swimming past. Additionally, other tank features like heaters and thermometers may develop sharp edges if they are older and have suffered some wear and tear.

Rough Tank Mates

Bettas are commonly known as aggressors but aren’t the only fish species that can get rough with others. Occasionally, even species known to be gentle community fish can bully others in the same aquarium. In these situations, the damage results from the aggressor biting your betta’s fins.

There are several reasons why your fish may become aggressive towards one another, including:

  • Poor water conditions causing stress
  • Lack of space for the number of fish
  • Food availability
  • Territorial behaviors
  • Illness or disease

The behavior may also result from pairing your betta fish with incompatible tank mates. Not all fish species can live together peacefully.

Improper Water Conditions

Betta fish can become stressed quickly from changes to their water conditions, lowering their immune systems and putting them at risk of damage to their fins. This is the result of stress caused by their environment. Check the conditions of your aquarium, including lighting, temperature, and pH balance.

Something as simple as allowing the water temperature to drop too low can trigger damaging behaviors. When experiencing cold temperatures, for example, betta fish will often try to burrow into the aquarium gravel as a survival mechanism. The gravel can easily damage their fins during this process.


We have all seen the small, decorative fish tanks often marketed to betta fish. While these can be found on the shelves of almost every big box pet store, they aren’t suitable for proper betta fish care. If this is the first time you are hearing this, don’t blame yourself – there is a lack of education in the pet space relating to a betta’s needs. You purchased a product marketed specifically for betta fish, which is a well-meaning decision.

Unfortunately, these little tanks lack the space needed for your betta to swim around comfortably, leading to boredom and increased stress. As your betta struggles with this feeling of boredom, they may start to bite and damage their fins.

Will Torn Betta Fins Grow Back?

Yes! If your betta’s fin damage is the result of a tear or bite (not fin rot), it can heal. But first, you will need to identify the cause of the damage and make changes to the aquarium to prevent it from happening again.

How Do You Heal a Torn Betta Fin?

As we just mentioned, the first step to healing your betta’s torn fin is identifying the cause of the damage. This may be easy if the reason is obvious, but for many fish keepers, it will require a process of elimination to ensure that everything has been addressed.

Start by checking the water conditions and temperature to ensure everything is adequate. If changes need to be made, address those concerns while monitoring your betta’s behavior.

While cleaning the tank, remove the decorations one at a time. Run your finger along any edges, checking for nicks or sharp spots. If you do find a spot of concern, set that item aside and don’t return it to the tank. Perform the same check on any heaters or thermometers and around the edge of the tank itself at any connection points.

Finally, pay careful attention to the other fish in the aquarium. Are there any other fish with fin damage? If so, this could help you in identifying the problem. Watch the way the fish interact with one another. Do you see any signs of damage? Do the other fish appear to be bullying or picking on your betta?

Alternatively, you can remove your betta from the aquarium and place them in a hospital tank or quarantine tank—a smaller tank with no decorations or other fish. This eliminates any potential causes from outside sources.

Within a week of ensuring your betta is in a safe, clean aquarium, you should start to see growth. The new growth will be clear at first. This is normal. Eventually, the color will return to that area, and before long, the fin will look as good as new.

Photo credit: Mariia Plakhotnia / Shutterstock.com

6 Tips to Prevent Torn Fins

While torn, damaged fins aren’t a serious concern, they aren’t a positive experience for your fish. The best approach is to prevent these incidents before they happen. This will allow your betta to thrive and live a happy, healthy life.

Carefully Monitor Water Conditions

Betta fish are very sensitive. Even minor changes to their water conditions, like the temperature or pH balance, can lead to stress. The best way to avoid this is to carefully monitor the conditions of your aquarium with reliable thermometers and regular testing.

Test strip kits, like Tetra EasyStrips 6-in-1 Aquarium Test Strips, can be purchased to make testing quick and easy. Simply dip the strip into the water to quickly check the water hardness, chlorine, nitrates, nitrites, alkalinity, and pH levels. Regularly scheduled testing will allow you to catch any changes early, make adjustments, and maintain balance.

For water temperature, there are many easy-to-read digital thermometers that will allow you to see the temperature of your aquarium with a glance, even from across the room. Of course, technology can fail. I always recommend including a traditional thermometer as a fallback.

Size Up the Tank

Do you have your betta in one of those small, decorative betta tanks? While you may not have known better when first purchasing the tank, you know now. Your betta should be kept in a 5-gallon tank at a minimum. However, this will increase if you add extensive decorations or create a community tank with other fish.

Check Decorations Before Use

Decorating your aquarium is a fun way to showcase your personality. However, not every decoration will be a good addition to your betta’s habitat. Before placing any decoration in the tank, take a moment to run your finger over the surface, checking for any nicks or sharp edges. The same check should be done along the edge of any artificial plants.

Another way to avoid accidentally placing artificial plants that could cut or snag your betta’s fins is to use live plants. Many beautiful and even colorful plant options can be used to create a beautiful and unique planted tank.

Create Multiple Hiding Places

Hiding places within the aquarium serve two essential purposes for your betta. These spots allow your fish to hide from other fish in the tank, reducing the risk of damage from aggression. They also provide a safe space for your betta to retreat if they are stressed from outside triggers like loud noises or excess lighting.

To give your betta more places to hide, consider choosing decorations with hollow interiors or cave-like features. This includes synthetic decorations like castles or skulls as well as rocks and driftwood, which can be used to create caves and crevices.

Choose Tank Mates Carefully

Before introducing new fish into a community aquarium, make sure to do your research. Bettas are best matched with more laid-back fish, such as tetras or rasboras. They can also live peacefully with bottom dwellers like catfish or snails. If your betta is a female, she can also be placed with other female bettas. However, if your betta is a male, be extra cautious about who you are introducing to the aquarium, as they are known to have more aggressive personalities.

Feed on a Schedule

When it comes to when or how often to feed your betta (or your community tank), the best approach is to create and stick to a feeding schedule. This helps to prevent stress that can arise from problems with food availability.

You can use an automatic fish feeder if you have a busy schedule or struggle to stick to a routine. Program your feeding times, fill the feeder, and walk away knowing your fish will be fed on time every time. If you use an automatic feeder, I recommend setting a reminder in your phone to let you know when the feeder needs to be refilled.

Final Thoughts: What to Do if a Betta Fish’s Fins Look Ripped

Fin damage is a common struggle faced by betta fish keepers. Luckily, it’s not a serious or life-threatening condition. With a few changes to your aquarium setup and water conditions, you can create the ideal environment for your betta to heal.

Moving forward, ensure that you pay careful attention to the aquarium to prevent this from happening again. That means regular tank cleaning, temperature monitoring, regularly scheduled feeding, and only adding décor that has been inspected for any sharp, rough edges that could cause damage.

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Britt Kascjak is a proud pet mom, sharing her heart (and her home) with her “pack” which includes her husband John, their 2 dogs – Lucifer and Willow – and their 2 cats – Pippen and Jinx. She has been active in the animal rescue community for over 15 years, volunteering, fostering and advocating for organizations across Canada and the US. In her free time, she enjoys traveling around the country camping, hiking, and canoeing with her pets.

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