A 29-gallon tank can hold how many goldfish? (Quick Answers)

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Beginners can start with goldfish because they are eye-catching and come in a variety of colors, making them a great choice. 

If they are cared for properly, goldfish can live for up to ten years. Without proper maintenance and space, their lifespan can decrease.

A 29-Gallon Tank Can Hold How Many Goldfish? (Quick Answers)

For a goldfish to live peacefully in a tank of four feet wide, or 29 gallons, it can grow up to eight inches long. 

As a result, one goldfish will fit perfectly in a 29 gallon tank. Adding more fish will cause them to have difficulty breathing, reducing their lifespan.

If you want your goldfish to live a long, healthy life and reach their full potential, you need a tank that is the right size. Goldfish need a tank that is 4 feet wide where they can live happily.

In contrast, a 29-gallon tank can hold nearly 109 liters of water, which is also very comfortable for goldfish. But you can only keep 1 common goldfish in a 29-gallon tank.

Having a 29-gallon tank will be enough to accommodate goldfish, as they grow large and produce waste. 

Goldfish grow rapidly and become enormous, and they are excessively active. In general, one goldfish is ideal for a 29-gallon tank. 

However, several other factors play a role in attracting goldfish to a tank, such as the filtration system, which should be ten times the tank volume, especially for fancy goldfish.

Despite being cold-water species, they prefer temperatures between 18 and 20 degrees centigrade. 

If they lack adequate space, they will have difficulty receiving oxygen, resulting in a shorter life expectancy.

Keep an eye on the nitrate level in the tank, as it shouldn’t exceed 40, and anything less than that will prevent their growth from being stunted.

Goldfish release hormones that limit their growth when kept in small tanks or with more than one fish in a 29-gallon tank. One goldfish can live in a 29-gallon tank with adequate care.

It would be ideal for one goldfish to be kept in a 29 gallon tank if it were kept in good condition.

What Is The Maximum Number Of Goldfish That Can Fit In A 29 Gallon Tank?

There are many factors affecting the growth, health, and maintenance of goldfish. There are some goldfish varieties that grow quickly and are very active swimmers.

Their sizes range from twelve to fourteen inches, and they require a huge tank of fifty gallons per fish, such as the comet goldfish.

Goldfish with six to eight niches, such as the fancy and fantail, can easily fit in a 29-gallon tank.

The larger the tank, the easier it is to keep the goldfish healthy. Most fancy and fantail goldfish prefer the upper and structured parts of the 29-gallon tank, which has an open area on top.

Goldfish produce a lot of waste, so a 29-gallon tank is a perfect size for cleaning their waste. The size of the tank is important, but a powerful filter can ensure their health.

In contrast, comet goldfish cannot be kept in small 29-gallon tanks due to their rapid growth and need for more water. 

Therefore, they require a minimum of a fifty-gallon tank, which is ideal for them and makes them easier to care for.

Fancy goldfish:

The 29 gallon tank is ideal for one fancy goldfish because they are medium in size and can reach 6 or 8 inches in length, so it is the perfect size for them.

Due to poisonous enzymes released into the water, they must be well maintained.

A contaminated aquarium with insufficient oxygen may shorten the lifespan of fancy goldfish, so tanks smaller than 29 gallons are not recommended.

A 29-gallon aquarium with more than one fancy goldfish will produce more waste and be harder to maintain.

Goldfish with fantails:

A 29-gallon aquarium is best suited to Fantail goldfish. They require a lot of water to thrive, and a 29-gallon aquarium holds around 109 liters of water.

Because they produce more waste, they also require strong water filtration on a weekly basis.

Comet goldfish:

Comet goldfish can reach up to 2 feet long, so a 29-gallon aquarium won’t be sufficient for them.

Comet goldfish require a larger tank, usually a 50-gallon one. In a 29-gallon tank, they may become ill.

If you have more than 1 comet goldfish, you’ll need additional tank space. Otherwise, upkeep will be difficult since they’re active swimmers that thrive restlessly everywhere.

Adding a fifty-gallon tank will keep them safe from disease and oxygen deprivation, requiring a fifty-gallon tank.

Is A 29 Tank Good For Goldfish?

When given proper accommodations and care, goldfish can grow up to 8 inches in length. In contrast, common fancy goldfish grow 4 inches long and require a lot of space.

One 4-5 inch goldfish can live happily in a 29 gallon tank. Goldfish are active swimmers and grow very quickly. 

29 gallon tanks are quite convenient for goldfish, but you cannot keep more than one in them. 

In contrast, if they grow over 6 inches, they may need more space or suffer from oxygen deprivation.

Is It Possible To Keep Two Goldfish In A 29 Gallon Tank?

There is no way that two goldfish can live and swim happily in a 29 gallon tank. A 3 inch goldfish requires a 4 foot wide space to live and swim happily.

It is possible to keep one goldfish in it, but two goldfish in this size tank will not be ideal as they grow large and produce a lot of waste.

Can Three Goldfish Be Kept In A 29 Gallon Tank?

A 29 gallon tank is very small for 3 goldfish. Goldfish grow very quickly, so a minimum of 30 gallon tank is needed for an adult fish.

Having the appropriate size will allow the goldfish to live longer and healthier. Only one goldfish can live longer in a 29 gallon tank.

In A 29 Gallon Tank, What Fish Can You Keep With Goldfish?

If you want to grow goldfish up to 6–8 inches, you will need at least a 30 gallon tank, but a 29 gallon tank also works well. 

However, if you choose tank mates and decorate it with other aquarium gadgets, you will have to be careful as they will reduce the space for them to swim.

You shouldn’t add too many teammates to the tank if your goldfish is over 4 inches, but you can add some tiny plants if your goldfish is under 3 inches.


This colorful fish can grow up to 2.5 inches in size and can be kept in a 29 gallon tank with 3-4 baby goldfish.

As they grow, you’ll need to upgrade the size of the tank to a 40- to 55-gallon one.


Suitable for small tanks, Tetras grow 1.5 inches to 2 inches and come in many colors. In a 29 gallon tank, 2-3 tetras can make good teammates with goldfish because they are peaceful and calm in nature.

Hatchet fish:

You can put three-4 baby hatchet fish along with a 2 inch goldfish in a 29 gallon tank since hatchet fish grow small, not more than 2 inches.


In your 29 gallon tank, you can add one or maximum two guppies, with a goldfish no larger than 3 inches. They are good choices since they grow no larger than 2 inches.


There are colorful, long-finned fish called bettas that will live peacefully with goldfish in tanks with a filter and heater.


Goldfish require the right size tank to live a long, healthy life. Since goldfish are active swimmers and grow rapidly, they need more space to swim and breathe. 

If more goldfish are added to a 29 gallon tank, they will feel suffocated and become ill.


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