How Big Do Glofish Get? (& Why It Matters)

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Last Updated on 2023-05-24

If you’re wondering how big your glofish can get, then you’ve found the right article! In this article, not only will you find out how big glofish can get you’ll also learn other fantastic facts about them as well!

How Big Do Glofish Get?

At the time of writing, there are 5 different kinds of glofish. The most common fish are barbs, tetras, bettas, sharks, and danios. And they come in many different colors, like shades of red, fuchsia, orange, bright green, blue, and purple.

It’s important to know that glofish don’t grow to a certain size, and their changed genes don’t affect how big they get. Since their genes have only been changed to give them a bright color, glofish will only get as big as their non-modified counterparts.

A Glofish’ maximum size depends entirely on the type of glofish. Glofish Tetras can grow 2.5-3 inches in length, glofish danios grow about 2 inches in length, glofish bettas grow to 2.5 inches in length, glofish barbs grow up to 3 inches in length, and glofish sharks grow up to 6 inches in length.

Like any other fish, they need to live in the best conditions possible. This will not only keep them happy and healthy, but it will also help them grow at a steady rate and get to their full size. You shouldn’t worry too much as long as you put them in a clean fish tank with good water.

How Big Do Glofish Tetras Get?

Tetras are one of the most well-known and most common tropical aquarium fish. This is because they are small, peaceful, easy to care for, affordable, and they come in many colors. This is also true with their glowing counterpart, the glofish tetra.

Since glofish tetras are genetically identical to the natural black tetra fish counterparts, the maximum size they get is also identical.

Glofish tetras can grow up to 3 inches if their living conditions are kept in the most optimal conditions. But most aquariums have glofish tetras that are about 2 or 2.5 inches long on average.

You can still make your glofish tetras larger than average by giving them a big, clean fish tank to swim in. This will make your glofish less stressed, which is good for their health and growth.

How Big Do Glofish Danios Get?

GloFish danios get as big as their natural counterparts, which reach a maximum size of about 2 to 3 inches long. Even though they are small fish, it’s important to remember that they must be kept in a school of at least six members and in a bigger tank.

Most of the time, caring for any kind of GloFish is about the same as caring for any freshwater aquarium fish. All they need is clean, good water, the right food, and a well-kept fish tank that is the right size. If you want to keep GloFish danio, remember that these fish live in cold water, so they need to be kept in a tank with water that is colder than most freshwater.

How Big Do Glofish Bettas Get?

The GloFish betta is a beautiful freshwater aquarium fish that has also been changed so that it glows in the dark. Glofish bettas are loved by many aquarists because of their bright color and beautiful fins.

Glofish betta are usually grow to 2 and 2.5 inches long, but they can sometimes grow to be as long as 3 inches, Like their non-glowing counterparts.

And if they are taken care of well and live in the best conditions, they can live for about 2 to 5 years. This fish isn’t usually easy to take care of, but they are a great pet.

Glofish betta males are very territorial and aggressive, so it’s important to choose their tankmates carefully, or they will fight and hurt or kill each other.

You shouldn’t put a male GloFish betta in the same fish tank with another male betta. If you want to put other fish in your fish tank with your glofish betta, cory catfish, guppies, and some types of loach fish would do well.

How Big Do Glofish Barbs Get?

The tiger barb is another popular fish among many aquarists because they are easy to care for and entertaining to watch as they swim quickly in groups of at least six.

hey have black stripes on their bodies that look like tiger stripes, which is how they got their common name. If they are taken care of, tiger barbs can live for about seven years.

The average length for Glofish tiger barbs is about 2 to 2.5 inches. Their regular counterparts, on the other hand, can grow up to 4 inches when left in their natural habitat.

If you want to keep glofish barbs, you should put them in an aquarium that is at least 15 gallons and keep the temperature between 72 and 78 degrees Fahrenheit.

Also, it’s important to remember that glofish barbs are very active fish that may annoy more calm and peaceful tank mates. They get along well with other members of their own species, but they can also be very competitive and aggressive. Like danios, they swim in groups, so it’s best to keep at least 6 of them together.

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How Big Do Glofish Sharks Get?

The glofish shark, despite its name, is not a shark. A glofish shark is basically a modified species of rainbow shark, which is a species of freshwater fish that lays eggs. Despite their name,  they share a closer ancestry with loaches, koi, and carp than they do with sharks.

Glofish sharks can grow about 4 to 6 inches long, just like their regular version. Because of this you’ll need to keep them in a large tank at least 20 gallons in size.

On average, they live between 4 and 6 years, but sometimes they can live as long as 8 years.

One thing to remember if you want to keep a glofish shark is that they tend to get aggressive if they are in a tank with other fish. They may also become territorial and so competitive that they will chase or bite other fish to scare them away.

It’s also worth noting that glofish sharks are bottom-dwellers, so they tend to fight more with other bottom-dwelling fish.


If you want to keep glofish, it’s good to know that they are basically the same as their natural counterparts, except that they have an unnatural color and glow in the dark.

They still need the same things and eat the same things, and nothing else has changed. To get them to grow as big as they can, put them in fish tanks with enough room, feed them the right food, keep them from getting sick, give them good water, and clean their tank often. Some glofish, like bettas and barbs, are aggressive and territorial, so make sure they have enough room to live on their own.

There are also some types of glofish that need to be kept in groups to stay healthy. The key to having a happy and healthy glofish in your aquarium is always to take care of its needs.

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