Do Betta Fins Grow Back? (How Long Does It Take?)

Betta fish are unfortunately prone to losing their fins, but it is possible that they can grow their fins back. As long as you monitor your betta to catch signs of them losing their fins, you can help nurture them back to health in some cases to help their fins grow back. 

One of the many reasons people love betta fish is because of their vibrant, colorful, and unique fins. While their fins are a source of beauty, fin rot can be a source of discomfort for your betta and can be an indicator of potential illness or environmental issues. 

Do Betta Fins Grow Back?

Betta fins can grow back when you are able to pinpoint the potential cause of lost fins and do what you can to remove that particular problem. Knowing what can cause bettas to lose their fins in the first place is your best bet to support them in the regrowth process.

The most common causes of fin loss in betta fish are:

  • Being housed with aggressive tank mates such as angelfish, serpae tetras, tiger barbs, or other male bettas
  • Bacterial or fungal infection.
  • Living in water that is too cold or is contaminated with ammonia or nitrites

However, there are other things that can also cause your betta’s fins to fall off. This article will help you identify all possible causes of fin loss in betta fish, as well as explain how you can support your fish’s recovery.

Betta fins can grow back when you are able to pinpoint the potential cause of lost fins and do what you can to remove that particular problem.

How Do I Prevent Fin Loss For My Betta Fish?

Knowing what can cause bettas to lose their fins in the first place is your best bet to support them in the regrowth process. Here are some things you can do to help your betta’s fins regrow more quickly and prevent them from being lost in the first place.

Taking care of a betta fish’s aquarium is one of the best ways to support their overall health, including their fin health. You should be doing water changes frequently, and making sure there is nothing foreign floating around inside of it.

You should also be testing the water quality and temperature often. The ideal environment for bettas is clean water between 74 and 79 degrees Fahrenheit. 

Clean Water

Betta fins have trouble growing back when your betta is not provided with an optimal environment for a healthy fish. A happy and healthy betta will have a much better chance of growing his fins back in comparison to a sick or stressed out fish.

Make sure your bettas water is regularly changed to avoid buildup of ammonia, nitrite, and nitrate and that the water temperature is between 75-80F. Also, make sure your betta has a large enough tank (at least 2 gallons, preferably 5).

You’ll want to include a filter in a tank, but not a filter that creates a strong current that might blow your betta around.

Betta Fin Rot

Fin rot is a very dangerous condition that betta fish can catch. Fin rot is a bacterial or fungal disease that eats away at the edges of your betta’s beautiful fins which causes some, if not all, of their fins to disappear completely.

Some of the common symptoms of fin rot include a ragged looking edge on the fins, and fins that look like they are coated with either a slimy substance or appear to have some fuzz. 

This is another reason why it’s so important to provide your pet with a clean environment and make sure their tank has adequate filtration as well as water changes completed on a regular basis.

One of the biggest causes of fin rot is inadequate, dirty water. If left untreated, it can be fatal to your betta.

If your betta has fin rot, you’ll want to treat it using a combination of Maracyn and Ich-X (which will treat bacterial and fungal infections respectively).

Alternatively, you can treat fin rot by adding 1-2 tsp of aquarium salt to your tank per gallon of water and leaving it for 7-10 days. Afterwards, change the water in your aquarium to remove the salt.

If your betta lives with scaleless fish (such as corydoras), you need to move your betta to a hospital tank by itself before starting treatment.

It’s important to change the water afterwards and not to use salt as a treatment if you have plants or marimo in your aquarium.

Once the condition has been treated, your betta’s fins will be able to slowly regrow.

Warm Water

If your aquarium’s water temperature regularly dips below 75 degrees, you’ll want to get a small heater to put into your betta’s aquarium to keep the water warm enough for your betta.

This will improve both its health as well as how active and happy it is.

Alternatively, if your tank’s temperature gets above 82F or so, you may try pointing a fan at the top of your aquarium so that it blows across the surface of the water. This will increase evaporation which will cool your water down a little bit.

Safe Decorations

Another thing you’ll want to look at is making sure there aren’t any sharp decorations in your aquarium. A lot of plastic aquarium decorations and cheap fake aquarium plants will have sharp edges that can snag and tear a betta’s fins.

Try running your finger around the insides of any decorations your betta can swim inside of to see if there are sharp edges caused by poor manufacturing.

If there are, try removing those decorations and replacing them with ones that don’t have anything that might snag your betta’s fins.

How Long Does It Take For Betta Fins To Grow Back?

How long it takes for betta fins to grow back can depend on the reason their fins were damaged or lost. If there is a clear-cut piece missing from their fin, and no other signs that might appear to be fin rot, it could just grow back on its own without your interference. 

That being said, it can take anywhere from a couple of weeks to a few months for your betta fish’s fins to grow back to their previous state. The time it takes can change if they accidentally injure themselves in the same area, or if you slack off on keeping their water fresh and warm enough for them. 

If you don’t treat the cause of the fin loss (other fish nipping at your betta, fin rot, etc), your betta’s fins may never grow back completely.

How Do I Maintain Water Quality To Avoid Fin Rot For My Betta Fish?

You need to be cleaning and monitoring their water’s condition and temperature very often. Try changing about 25-30% of their water each week to keep the water clean and free of pollutants.

Be sure that their tank or aquarium is big enough for them to move around in as well. You’ll want to make sure they’re being kept in at least a 2 gallon aquarium (bare minimum) and preferably a 5 or 10 gallon aquarium.

This will give them enough space to move around and enough water to buffer against swings in water quality.

You also need to make sure their water temperature stays within the preferred range of 75-80F for temperature and 6.5-8 for PH.


It’s never fun to see that your betta’s beautiful fins have gotten ragged and ugly – and it’s certainly not fun for your betta.

Luckily, this condition is easily reversible if you’re able to identify the condition and address its causes. Follow the advice in this guide, and your betta should be looking and feeling better in no time.