Betta Fish Bubble Nests (Every Question Answered)

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Last Updated on 2023-12-31

If you’ve ever wondered about betta fish bubble nests, then you’ve found the right article! In this article, not only will you learn what they look like, you’ll also learn why they happen and what to do about them!

So keep reading to find out everything you need to know!

What Do Bubble Nests Look Like?

In general, bubble nests look like what you’d expect; a mass of bubbles floating near the surface of your Betta’s tank. However, individual bubble nests can vary greatly in appearance depending on several factors and circumstances.

betta eggs

Your Betta’s bubble nest may be made up of very small bubbles that look more like soap foam, or it may consist of larger bubbles that have a more distinct shape. But there are also other ways your Betta’s bubble nest can vary in appearance.

Some bettas may also build bubble nests that are concentrated around a certain spot and don’t have a wide surface area, while other bettas build nests that are more spread out over the surface of the water.

Your Betta’s nest may also be a thin layer of bubbles that you can see through, or it might be a thick, opaque layer. Your Betta will usually build his nest along the side of his tank, or if there is an object in his tank that breaks the surface of the water, he may build his nest around this object, using it as a base.

Why Do Betta Fish Build Bubble Nests?

Bettas build nests when they’re relaxed and happy. It’s an indication from the males that they’re ready to mate. Females don’t need to be present for a male to do this. And in rare circumstances you may even notice your female betta doing it.

Bettas build nests like these because, in the wild, they tend to live in dirty, shallow, slow-moving, or stagnant water with a low content of oxygen. These environments keep bettas safe from larger predators who need a more oxygen-rich environment to survive, but the downside is that the conditions of these environments aren’t very good for hatching eggs.

That’s where bubble nests come in; they provide a place for the eggs to safely hatch while giving the eggs the oxygen they need to develop properly. The fry also need the shelter of the nest after they’re born since they’re very poor swimmers in the first few days of their lives.

How Do Betta Build Bubble Nests?

As part of this courtship, the male betta will start to build a bubble nest. He will use his mouth to create bubbles on the water’s surface, which he will then gather together into a cluster. He will continue to add bubbles to the nest until it reaches a sufficient size, which can vary depending on the size of the tank and the betta’s preferences.

The bubbles that make up the nest are formed from a combination of air and saliva. The male betta will produce bubbles by taking in air at the water’s surface and then expelling it through his mouth. By adding saliva, it also helps improve the buoyancy and stickiness off the bubbles too.

What Are The Best Conditions For Your Betta To Build A Bubble Nest?

If you want your betta to create a bubble nest, try to recreate these conditions as best you can:

  • Water Temperature: Make the water a little bit warmer around 78-82°F (25-28°C); this will simulate what it’s like in the breeding season, making your betta more likely to create a nest.
  • Water Quality: Clean, well-oxygenated water with no ammonia, nitrite, and nitrate will help your boy feel more comfortable.
  • Feed Them More: By giving your betta more food, he’ll feel more and more like he’s ready to breed. Ideally you should be using live food like mosquito larvae.
  • Tank Size and Shape: Bettas prefer long, shallow tanks of at least 5 gallons to provide the necessary surface area for bubble nests.
  • Lighting: A balanced cycle of 8-12 hours of light and 12-16 hours of darkness matches bettas’ diurnal nature and encourages nest building.
  • Overall Keep Him Healthy: Only healthy, well-conditioned male bettas build bubble nests, often as part of mating behavior.

How Often Do Bettas Build Bubble Nests?

There’s no straightforward answer for this, as bettas don’t build bubble nests according to any type of schedule. In the wild, betta fish tend to build bubble nests whenever breeding season hits, but if your betta is in a temperature-controlled tank (like he should be), he won’t have a breeding season.

The peak breeding period for male bettas is when they’re between 4 and 12 months of age, and it’s during this time when your Betta will probably feel most inclined to build bubble nests. If your Betta isn’t at the right age for spawning, he may feel far less inclined to build bubble nests regularly.

Do Bubble Nests Mean Your Betta Is Happy?

This is a bit of a tricky question. On the one hand, if you see your betta building a bubble nest, it’s a good sign that your Betta is healthy, but it’s more indicative of the fact that he’s ready to mate. On the other hand, you can have a healthy and happy betta fish who never makes bubble nests simply because he’s not in the mood to mate.

Basically, the presence of bubble nests does indicate that your Betta is having a good time, but you shouldn’t automatically assume the worst just because you don’t see him make any. However, there may be some undesirable reasons why your Betta isn’t making any bubble nests, which we’ll discuss in the next section.

Why Isn’t My Betta Making a Bubble Nest?

As we mentioned, a bubble nest isn’t the only sign you should rely on to determine if your Betta is healthy or not. However, there are several reasons why your Betta might not be building a nest that you should be somewhat concerned about.

There’s also the possibility that your Betta did build a bubble nest, and you just can’t see it. If you happen to have objects or décor in your tank that are floating on the surface of the water, then your Betta may have just built his nest under one of these objects; in the wild, bettas often build their nests under floating objects.

  • Lack of Stimulation: If your betta is bored in his tank all the time, with no stimulation, he’ll have little reason to build a bubble nest. While adding a female is best, just making sure he is suitably entertained will also do the trick.
  • Excessive Filtration: Overly strong filtration can create currents too powerful for maintaining bubble nests, meaning your betta won’t be able to build one.
  • Dirty Water: Poor water quality and high pH levels from a grimy tank can negatively impact your Betta’s health making it hard for them to build nests.
  • Lack of Décor: Bettas prefer tanks with plants or decorations near the surface to anchor their bubble nests; a bare tank may discourage nest construction.
  • Age: Bettas that are too old or too young will be less inclined to build nests as they pass the prime breeding stage, an aspect beyond the owner’s control.

How to Encourage Your Betta to Build a Bubble Nest

However, unless the problem is caused by your Betta’s age, there are always steps you can take to try and make your Betta happier and encourage him to build a bubble nest. In this section, we’ll go over some of these steps.

Make Sure He’s in the Right Tank

You may have seen betta fish kept in a really small tank before, but this is not something that should be done if you want to properly take care of your Betta. Betta fish do better when they’re in a tank at least a 5-gallons in size.

A tank smaller than that just doesn’t have the space that a betta needs to build a bubble nest, not to mention the space a betta needs be properly active.

Use the Right Filter

Since bettas tend to make their nests in slow-moving water, you don’t want to use a tank filter that generates a strong current, otherwise your betta won’t be able to build a nest properly. If you have an adjustable filter, try putting it on its lowest setting. The less disturbed your tank’s water is, the more likely your Betta will try to construct a bubble nest.

Clean Your Tank Often

You should probably clean your tank about once a week, depending on its size (smaller tanks will need to be cleaned more regularly). And remember to change about 10-20% of water per week as well.

You should also regularly check the acidity level of your tank to make sure it’s suitable for your Betta. It’s pretty easy to find out the acidity of your Betta’s tank; a good pH testing kit will tell you everything you need to know about the acidity in your Betta’s water.

Ensure the Water Is the Right Temperature

As we previously mentioned, the best temperature to keep your Betta’s tank at is about 78° to 82° F. Unless you have some kind of special temperature-controlled room to keep your Betta in, you’ll probably need a tank heater to get your water to the right temperature.

When selecting a heater, you’ll want to find one that is the right size for the tank you have. It’s not a good idea to overheat your tank; that can be as harmful to your Betta as a tank that is being underheated.

Decorate Your Tank

Decorating your tank serves two purposes; it gives your Betta a base to build his nest on, and bettas like having interesting and stimulating things in their tank.

Adding some tank plants, a plastic castle, or any other piece of décor can really make a difference in your Betta’s mood. You may also want to get better lighting for your tank; swimming around in a dark, gloomy tank can negatively affect your Betta more than you might think.

In particular, having a few items floating on the surface of your Betta’s tank can help a lot since they can use these to build their nests. You can use basically anything for this purpose, as long as it’s not toxic. I personally love using duckweed.

Introduce a Female to the Tank

If your male Betta is of breeding age, you can introduce a female betta into his tank; this might prompt him to start building a bubble nest.

However, unless you are a betta fish breeder yourself, you should never allow the two fish to actually make contact; try and find a clear divider you can place in your tank to let the two fish see each other but to keep them physically separate.

Also, don’t leave the female in the same tank with the male for too long, as this can cause undue stress on both bettas.

Place a Mirror Near the Tank

Similar to how the presence of a female betta can prompt your male Betta to build a nest, the presence of another male betta can put your Betta in a competitive mood, so to speak; this can also prompt him to start building a bubble nest.

Of course, given how territorial male bettas are, you don’t actually want to put two male bettas in the same tank. However, you can place a small mirror next to your Betta’s tank, which may have the same effect without any of the danger.

You don’t want to leave the mirror next to your Betta’s tank for too long, though; if he believes that another male betta is here to stay, it could stress him out a lot.  

Should I Remove My Betta’s Bubble Nest?

There is no real need to remove your Betta’s bubble nest. However, it also doesn’t matter if you want too. It’s completely up to you. If you want to remove it while you’re cleaning and put it back, you can try using a ladle, to scoop it out. Remember, nothing is going to happen if you destroy the bubble nest.

Do Female Bettas Build Bubble Nests?

Female betta fish do make bubble nests. However, it is very rare. Making bubble nests is a natural reproductive behavior for the betta fish, but the nests are nearly always made by the males.

There are a number of reasons why you think you have spotted your female Betta making a bubble nest.

First of all, she might be assisting a male betta fish. While males are always going to do most of the work, there are rare occasions where your female will try to help out too!

Also, if you have a plakat female, they look extremely similar to males. So there is a chance that you’ve got a male not a female (woops)

Check for the ovipositor which is a white dot behind the fish’s ventral fins, which are located just below and behind the gills. Only the female Betta has an ovipositor.


Here are some of the most common questions people have about bubble nests.

Do Other Fish Make Bubble Nests? 

Other fish species have been observed making similar structures with a variety of materials such as plants, leaves, or debris. One of the most obvious examples of a fish that builds a bubble nest is a gourami, which is a close relative of betta fish.

Will Floating Plants Affect A Betta’s Bubble Nest?

I love putting floating plants in the tank to give my betta somewhere to build from. However, the one thing I will say is you need to make sure your betta has plenty of space to build his nest, so don’t let the plants overtake the tank.

How Long Does It Take A Betta To Build A Bubble Nest?

In my experience it normally takes bettas 5-7 days to completely build their bubble nest, although, again it does depend on the individual. My last betta was quite lazy, so it took him a while to build his nest.

What Happens If You Interrupt A Betta While He’s Building A Nest? 

Again, this really depends on the betta. I’ve had some bettas after being disturbed that completely abandoned their nests, and others who didn’t care when they were disturbed. So it’s all up to your individual betta.

Final Words

If this is the first time you’ve ever seen your betta fish make a bubble nest, then it’s understandable if you initially found it weird and unexpected. However, once you know what they are, then watching your Betta build such a nest is a really interesting experience.

On top of this, a bubble nest is also a good sign that your Betta is healthy, happy, and in the prime of his youth. If you see a bubble nest in your Betta’s tank, it means you’re taking care of him, right!

Even if you can’t get your Betta to build a bubble nest of his own, by following the tips we’ve given you today, you should have no problem maintaining a great environment for your Betta to live in. We hope that caring for your Betta brings you joy for many more months or years to come!


Ultimate Betta Fish Care Guide
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Hey! I'm Nicolas from Iguane Media !

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1 thought on “Betta Fish Bubble Nests (Every Question Answered)”

  1. I inhearited a male Betts, actually saved him from the toilet . I got home a tank and female and new the has a bubble bed. What do I do to have babies


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