30 Gallon Goldfish Tank: Goldfish Tank Size Guide

“How many goldfish in a 30 gallon tank” is a common question that beginners always ask me when they want to raise this fish.

Goldfish come in a number of different varieties. Around the world, there are about two hundred different varieties of goldfish. 

They are considered one of the most popular pets around the world. One of the benefits of owning goldfish is the wide variety of varieties one can choose from. 

Can they be housed in a tank of 30 gallons, and how many of them can they hold? It’s worth taking a look.

How Many Goldfish In A 30-Gallon Tank?

The answer is 2-3 goldfish for the best environment in a 30-gallon tank. Some aquarists think that they can take care for 4 but just in case you have 35-gallon tank for keeping goldfish. The more goldfish you want to raise, the larger tank you should prepare. And here are reasons why 2-3 goldfish is ideal.

First, let’s think about how much water a common goldfish need. One goldfish requires enough water for their basic environment. Every fish tank whatever the tank size should has at least 10 gallons of water in average. That is also the reason why many people wonder about can goldfish live in 10-gallon tank. We had an article about that here. Giving the deficient accommodated can harm to the goldfish’s health.

Then, we should think about the inches of fish too. Depending on what types of goldfish, goldfish can grow up to 10-12 inches in length. Ensure that they have enough space to swim around freely.

If you are beginner and you just don’t know if some goldfish need a heater for their aquarium, you should know the basic knowledge is that goldfish are cold-water. It’s a popular social fish which can adapt to numerous of temperature. You needn’t spend too much many for this items if your goldfish from tropical land.

Fantail goldfish can easily live for 3 to 5 years
Fantail goldfish can easily live for 3 to 5 years

How Many Fancy Goldfish In A 30 Gallon Tank?

Do you know about this goldfish? Which are goldfish may included? As you know, goldfish come to many different types. Each type has their own requirements for the suitable living way. Obviously, the amount of goldfish can be change depends on which types they are. For instance, fancy goldfish species like fantail goldfish, oranda goldfish, and even comet goldfish have a tendency to grow more slowly and remain smaller. Normal adult goldfish, on the other hand, can go as long as 14 inches.

For that reason, if you want tho keep goldfish like them, it’s possible to keep more fish in the same size tank. Two fancy goldfish can live comfortablely in a 30 gallons tank.

If you choose to mix different species, keep in mind that certain goldfish might not get along. To determine whether the species you intend to keep together are compatible, it is best to perform some research. Even though goldfish are not typically aggressive fish, some of them occasionally bit other fish’s fins.

How many fantail goldfish in a 30 gallon tank?

2-4 fantail goldfish is good.

Both beginners and experienced fish keepers can handle goldfish of the fantail variety in a straightforward manner. As a result, it has become more accessible for people to maintain the variant and it is well-loved by many people. Popular different types of goldfish can not unincluded them. Their distinctive appearances give the aquarium a luxurious feel.

Goldfish Fantails can be found so quickly these days, and they are also easy to take care of because they are so small in size. There is a general assumption that this species of fish is capable of living up to 8 years. 

If you have a 20 gallons tank, then you are able to fit one fantail in it. The tank for from 5 fish should be extended by quite large, at least 10 gallons in addition to adding a new fantail fish to one that already exists.

Fantail goldfish can grow from 6 to 8 inches
Fantail goldfish can grow from 6 to 8 inches

Does a fantail goldfish live well in a 30 gallon tank?

Goldfish are found on the planet in over a hundred different species. Generally speaking, goldfish require a tank that has a volume of 20–30 gallons so that they can live comfortably. However, to stay healthy and live without any problems, goldfish need to be housed in tanks of 50-gallon in order to stay in shape.

It is worth noting that a they can easily live for 3 to 5 years in a tank of 30 gallons. 

The recommendation is for one to add an additional 10 gallons per goldfish if they want to add more goldfish to a tank that holds 30 gallons.

Fishes have an inclination to produce a lot of waste more often than any other type of pet animal. This means that it is better for these tropical fishes to be given more room to move in the aquarium and you should keep the water clean too.

Is It Possible To Keep Fantail Goldfish In A 30 Gallon Tank For A Long Time?

An aquarium of up to 30 gallons will hold a goldfish. There is no need to want to place more than twenty gallons of space for the majority of the goldfish species. 

There are some species of animals who find the 30 gallons aquarium to be a blessing, especially for them.

Goldfish like comets, however, are the only ones that need more space per fish.

Goldfish can grow to heights of nine inches and are thus quite large. It is, however, not harmful to a goldfish to take up residence in a thirty-gallon tank, as they will not be cramped. Despite being able to live for up to five years, a fantail goldfish can only be kept in a 30-gallon tank. 

In A 30 Gallon Tank, How Large Can Fantail Goldfish Grow?

Approximately 18.7 inches is the maximum length of the fish record holder. Although most species are not that large, there are a few exceptions. Generally, an adult fish will reach a height between 10 and 12 inches. In comparison to all other species of goldfish, the oranda goldfish has the most length. 

It is thought that fantail goldfish should have at least 30 gallons of water in order to become large.

The fish can grow much longer than 8-10 to 10-12 inches, provided that they have access to more water or more space with the right food.  

These omnivores are able to stay fit and healthy by eating the right food and swimming in the right way.

How Many Gallons For Goldfish?

After knowing about the amount of goldfish that you should keep, it’s probably needed to know the general tank size for single fish or multiple goldfish too. The answer for the minimum tank size is at least 20-gallon tank for the best tank. 

Otherwise, 50-gallon tank seems insane but in fact, it’s okay if you have. Some people also believe that a good size for goldfish that they can swim around comfortablely. Don’t forget to take care about filtration or enrichment.


Have goldfish got air pumps?

No. Although it is not required, an air pump can help to maintain a high level of oxygen in the water. Get an air pump made specifically for aquariums if you decide to use one. An air pump can be beneficial for aquariums, as it helps to provide oxygen for the fish and other aquatic organisms.

Are gravel needed for goldfish?

Once a week. Goldfish are among the most noticeable water wasters despite their stunning appearance. Fish gradually lose their attractiveness as the poisonous level increases without a goldfish tank clean. When fish tank water is not properly cleaned, the pH falls and the water becomes more acidic.

How frequently should a goldfish tank’s water be changed and cleaned?

Once a week. Goldfish are among the most noticeable water wasters despite their stunning appearance. Fish gradually lose their attractiveness as the poisonous level increases without a goldfish tank clean. When fish tank water is not properly cleaned, the pH falls and the water becomes more acidic.

5/5 - (1 vote)