How Big Do Betta Fish Get? Do Betta Fish Grow Fast?

| Published On: is supported by its audience. When you buy through links on our site, we may earn an affiliate commission. Learn More
Growth Potential of Betta Fish

Undoubtedly, the Betta fish is among the coolest fish, especially if you’re fortunate to own one in your aquarium. They have strong personalities, are dynamic, and are bright and colorful.

Perhaps the fascinating aspect of the hobby of fish keeping is discovering the mysteries of fish. I think I will be better able to understand and care for the inhabitants of aquatic tanks as I have more opportunities to learn about them.

Bettas require a suitable tank habitat and growth-promoting circumstances to be healthy, flourish, and reach their full length. Other elements affect that, which I will discuss in more detail below.

Do Betta Fish Grow Fast?

After 6 or 7 months of life, baby bettas can attain their maximum growth potential. But it’s not quite that easy. Many different things affect how they develop.

Image of two purple betta fishes

The most crucial factor is water quality. A Betta living in a tank full of spring water will be able to grow to the same size as one living in poor water with lots of pollutants.

What your Betta fish eat is another element that could cause early demise and sluggish growth. They will gain weight quickly, become big and attractive, and most essential, eat a lot of protein.

How Big Do Betta Fish Get?

They might reach 3 inches under carefully controlled circumstances. The type of diet, DNA, water quality, and general health are a few factors that could spur their growth.

Because they typically grow bigger than the other betta fish species, the Betta anabantoids, also referred to as the giant betta, are unusual.

Image of a beautiful betta fish

The maximum size of a typical betta fish is 3 inches, but this species can grow to seven inches. Here is my opinion if you’re trying to decide which of these two kinds you should bring home.

Choose betta splendens for a hobby aquarist who simply wants a low-maintenance house pet. The gigantic betta will suit your personality more if you’re an enthusiast who enjoys pushing things to their limit. However, you’ll have to acquire a bigger tank and feed them more frequently.

How To Make Your Bettas Get Bigger?

Betta fish cannot be housed together, and there is typically insufficient shelf space for one aquatic species to accommodate that many tanks. Therefore, pet retailers maintain betta fish in little cups.

However, if you want your betta to reach its full potential, you need to give it a habitat that is at least 5 gallons in size. Betta fish do not also grow to the size of their tank.

Betta fish are a species of relatively hardy fish, although they are nevertheless prone to many typical aquatic illnesses.

You should reduce stressors that can cause early mortality to guarantee optimal growth. Ensure your tank’s water stays within the tropical limit of 75 to 80-F and maintain the highest possible water quality. The best heaters include internal thermostats that keep the room at 78 degrees Fahrenheit.

A varied diet of items high in protein can also aid your betta’s growth. Since betta fish are carnivores, they must feed a combination of freeze-dried bloodworms, brine shrimp, and high-quality, protein-rich betta pellets.

As an additional way to mimic their native habitat, you may also think about using live meals; however, you may need to be cautious about their contamination.

Maintaining a healthy habitat will increase your betta fish’s lifespan and overall size. When betta fish are healthy, they grow and prosper.

Does Betta Fish Grow Depending On The Size Of The Tank?

Although betta are less affected by their surroundings than snakes and other reptiles are, having a tank that is too small will eventually impede their growth.

Of course, none of that discusses the negative psychological issues that are having your betta live in a small space can bring about.

Image of betta fish in water of fish tank

You’ve probably heard of and even seen the little betta tanks that some people keep in one-gallon containers. That is a typical misunderstanding, and you shouldn’t keep your betta in such a small space.

5-gallons is the suggested tank size for betta fish. Of course, you’ll need something much larger if you’re breeding betta or just have a lot more of them. Ten gallons may seem large, but in the context of aquarium sizes, it is actually rather small.

How To Ensure Your Betta Grows To Maximum Size?

While there is no foolproof way to guarantee that your fish will reach a specific length. You can adopt some excellent habits regarding what to feed them and how to set up their tanks to keep them robust and healthy.


Temperatures in the 75 to 80 degrees Fahrenheit range are ideal for keeping betta fish healthy.

pH Value

For bettas, a pH of 6.5-8 that is somewhat neutral is ideal. Although they are tough fish and can survive at levels beyond this range, they do best in an environment that is more neutral and healthy.

And even though they are typically resilient, keep in mind that they are still vulnerable to typical aquatic infections.


As carnivores, bettas need a balanced diet of foods high in vitamins and minerals. Their diet should include not only pellets or flakes made especially for them but also live foods and supplements like freeze-dried bloodworms or brine shrimp.

As a side note, merely giving them more food won’t probably result in the betta fish growing any faster. Stick to your planned betta feeding schedule for the best results because overfeeding can cause major health issues like bloat and stomach issues.

How Large Of A Betta Tank Do I Need?

You may get several tank sizes at various prices in pet stores. But when you compare the price of a 10-gallon tank to a 1-gallon tank, you’ll see that it’s far more affordable.

That’s because a 10-gallon tank is the generally accepted ideal size for a betta fish, and many reputable businesses manufacture them in large quantities.

Image of betta fish hiding in aquarium plants

In addition, the price difference between a 1-gallon tank and a 10-gallon tank is negligible, given the amount of open swimming room your betta will have. Therefore, if you only want to keep one betta in it, I advise buying a betta tank that is at least 5 gallons in size.

Otherwise, the bigger the tank you create if you intend to construct a community tank, the better. Since no one wants to see a sad betta fish in an unadorned water bowl without aquarium plants, many seasoned aquarists would advise you to get a bigger tank for your betta fish.

Betta fish need a lot of hiding places, aquatic plants, and decorations because they are territorial in order to have a long and happy life.

How Big Do Betta Fish Get In The Wild?

Betta fish often remain on a smaller scale, both in captivity and in the wild, in contrast to species such as the goldfish, which might grow to great sizes of up to 18.7 inches in length.

Wild betta fish are understood to grow to a maximum length of 2.5 to 3 inches. These little and vibrant fish species are better suited to relatively limited spaces like rice fields and tiny ponds, in which a bigger fish would undoubtedly start to feel constrained by space.

This is not to say that they do not require the appropriate amount of room; on the contrary. Betta males, in particular, will compete for territory, engaging in extravagant defensive demonstrations and even fending off other fish for enough space.

Final Verdict:

Betta fish are lovely creatures that give your home aquariums more oomph. However, you are the owner’s duty to provide them with the ideal tank configuration and the appropriate tank size.

I have explored everything about Betta fish growth, whether you are a beginner or an expert hobbyist looking for a specific answer.

With an understanding of what to expect from your Bettas at each stage of their development, you can enhance the surroundings of your fish to promote their health and growth. The typical betta fish doesn’t get very large. It isn’t easy to find one that is 3 inches.

Focus on giving them the proper care, and you’ll have a cheerful, healthy, and lively little pet for years!

Frequently Asked Questions

#1 – How Big Can A Betta Male Get?

Male bettas average 2.5 to 3 inches in length, including the fins when they are fully grown. Due to variances in diet or breeding, some bettas could be slightly smaller, but they usually stop growing once they reach this size.

Compared to adult female betta fish, adult male betta fish typically have larger fins and more thrilling, brilliant colors.

#2 – How Long Till A Betta Is Full Grown?

When compared to other fish, betta fish are rather little creatures. Individuals that are fully formed and in good condition can grow to a maximum length of about 3 inches or 7 cm.

However, their real average length is only 2.25 inches or 5.7 cm. The size of male and female betta fish is similar.

#3 – Do Betta Fish Grow In Bigger Tanks?

It’s a frequent fallacy that the size of their aquarium influences betta fish’s growth. Bettas’ ability to grow is constrained more by their genetic potential for growth than by their immediate environment.

There would be more reports of fully grown betta fish reaching tremendous sizes in the tropics where they originate if betta fish could just grow to the size of where they resided! Similarly, when you gradually upgrade to larger tanks, you will notice that your fish cannot stop growing.

#4 – How does Big Do Female Betta Fish get?

Both male and female bettas are 3 inches long at their largest size. The fins of female betta fish tend to be a little bit smaller than those of male betta fish. However, this does not immediately imply that male betta fish get bigger.

In addition, because they don’t use display-based strategies to claim territory, females are typically paler and less colorful than their male counterparts.

Your Author

  • Since 2009 I've been writing on different media portals about fishing. Here on this website, it's time to share those experiences I've witnessed in my entire life so far. Let me help you get the best stuff you need while fishing.