If you’ve ever walked up to your betta tank only to see a mass of bubbles floating on the water’s surface, you might have wondered what was going on.
The good news is, it’s nothing to be concerned about; it’s just a bubble nest.
There’s a lot of myth and hearsay surrounding betta bubble nests, however, so it can be tough to separate the fact from the fiction.
We’re here to set the record straight! Read on to find out exactly what a bubble nest is, and why and how betta build them.
- What is a Betta Bubble Nest?
- Watch Some Bubble Nest Making in Action
- Why Do Betta Build Bubble Nests?
- Is it True Betta Only Build Bubble Nests if Happy?
- How Often Would a Betta Naturally Build a Nest, and at What Times?
- How Often Do Betta in Tanks Build Bubble Nests?
- Is it Normal for a Female Betta to Build a Bubble Nest?
- How Can You Encourage a Betta to Build a Bubble Nest?
- What to Take Away
What is a Betta Bubble Nest?
Gross but true: betta bubble nests are constructed from a mix of air and saliva.
A betta makes their bubble nest by gulping big mouthfuls of air from above the surface of the water and making that air into bubbles using their saliva.
Betta saliva contains a special protein that helps with adhesion and makes the bubbles strong and long-lasting.
As they go on, the betta sticks one bubble to another, and eventually a full bubble nest is formed.
Depending on the individual and the environment, a bubble nest can range from just small cluster of bubbles to a huge mass that takes over much of the surface of the water.
Watch Some Bubble Nest Making in Action
It’s one thing to describe what a bubble nest is, but it’s another thing to see one.
This video shows a busy male betta in action, constructing a bubble nest.
Why Do Betta Build Bubble Nests?
As you might have guessed from the name, a bubble nest is just that: a nest.
It houses the betta’s eggs and, once hatched, the fry, who stick around until they’re large enough to have a decent chance at survival on their own.
Since it’s the male of the species who initiates courtship and guards the eggs and fry, it‘s he who builds the bubble nest, too.
After spawning occurs, he collects up the eggs and places them inside the bubbles.
So, now we get down to why, exactly, betta eggs are best off houses in little bubbles of air.
Well, there’s some speculation about this and nobody knows for certain, but one popular theory is that wild betta often live in fairly dirty water without much oxygen, so the air bubbles are necessary for the development of the fry.
Another theory is that betta fry need to develop close to the surface of the water for their swim bladder to develop properly, but this hasn’t been proven.
Finally, it’s possible that the purpose of the bubble nest is to attract food for the fry. Microscopic organisms, known as infusorians, are drawn to the bubble nest, and these tiny critters will end up as dinner for the growing fry.
Is it True Betta Only Build Bubble Nests if Happy?
A common hypothesis within the fishkeeper community is that betta only build bubble nests when they’re happy.
While this has a degree of truth to it, it isn’t exactly accurate.
Building a bubble nest is simply a natural, instinctual act. All living creatures have evolved with the innate desire to pass on their genes, and in order to mate, a betta must first build a bubble nest.
You’ll find cases of betta in dank, unsuitable environments building bubble nests. Likewise, betta who are extremely sick may still make bubble nests. So, building a bubble nest isn’t automatically an indicator that your betta is healthy or happy.
That said, what it does indicate is that your betta feels ready to breed, and some betta will only feel ready to breed if their surroundings are optimal.
While building a bubble nest can sometimes indicate a betta is happy and comfortable in their surroundings, it doesn’t necessarily mean this.
How Often Would a Betta Naturally Build a Nest, and at What Times?
There’s no mating season for betta – healthy females will produce eggs all year round – so a betta might produce a bubble nest at any time.
As soon as a male betta has staked out a territory of their own, they’ll start to produce bubble nests as a sign that they’re ready to mate.
Once they’ve mated and raised their fry to the point where they’re large enough to fend for themselves, a male betta will start building a brand new bubble nest, to prepare to bring up another brood.
How Often Do Betta in Tanks Build Bubble Nests?
Although they’re only small, betta still have their own personalities and no two are the same.
You’ll find that some betta are constantly building bubble nests – weekly or even daily – whereas others never or hardly ever build them.
It’s perfectly normal for a betta not to build bubble nests, so if you’re sure that they’re healthy and the size of and conditions in their tank are correct, there’s nothing to worry about.
Is it Normal for a Female Betta to Build a Bubble Nest?
When you do your research, you’ll find most sources tell you that only male betta fish construct bubble nests.
However, there’s plenty of anecdotal evidence out there to suggest female bettas occasionally make bubble nests, too.
Without looking at every case individually, it’s tough to know what’s going on.
It’s not unheard of for pet stores to sell plakat males as females if they’re not aware they’re meant to be short-finned.
It’s also easy for someone new to keeping bettas to mistake a normal collection of bubbles on the surface of the water, from filters or their fish breathing out, for a bubble nest.
That said, there’s also a possibility that some female bettas make bubble nests for unknown reasons. After all, there are still all kinds of mysteries in the natural world!
How Can You Encourage a Betta to Build a Bubble Nest?
If you want to breed your betta, or you simply want to see a bubble nest up close, you might be wondering if there’s any way to encourage your betta to get building.
As stated earlier in this article, optimal tank conditions can entice betta to start building bubble nests, but there can be other factors, too.
Here are some things you can try to encourage a betta to build a bubble nest:
- Make sure there’s little to no current in your betta’s aquarium. Even the slightest current can disrupt a bubble nest so it won’t hold together.
- Leave floating debris, such as aquarium-safe leaves, in your tank. Betta like to build bubble nests under something, as it offers extra protection.
- Warm water – between 78-82 degrees Fahrenheit – is ideal for spawning, so it may encourage your betta to start building a bubble nest.
- Keep your tank clean and check that the water parameters are all correct.
- If you plan to breed a pair of betta, try putting the female in sight of the male, as this can sometimes spur them into action.
What to Take Away
The construction of bubble nests is a fascinating betta behavior and is extremely interesting to watch.
While many male betta will make a bubble nest at some point, others won’t, so it shouldn’t concern you too much, providing you know your betta is kept in proper conditions.