55 gallon fish tank dimensions


55-gallon fish tank dimensions

If you’re an avid fish keeper, you know that choosing the right tank size is critical for your fish’s health and wellness. A 55-gallon fish tank is a popular choice for beginner and experienced hobbyists alike. With its spaciousness and versatility, a 55-gallon tank can be the perfect home for a wide variety of freshwater and saltwater fish species. This article will explore the various 55-gallon fish tank dimensions, including its size, shape, and weight, and how they impact the fish and equipment you can keep in the tank.

55 Gallon Fish Tank Dimensions

55 Gallon Fish Tank Dimensions

A 55-gallon fish tank, also known as a 55-gallon aquarium, is a popular choice among hobbyists looking to house a variety of fish species. The dimensions of a standard 55-gallon fish tank are typically 48 inches in length, 13 inches in width, and 20 inches in height. However, it is important to note that the exact dimensions of a fish tank may vary slightly depending on the brand and model.

55-Gallon Fish Tank Shape Variations

55-Gallon Fish Tank Shape Variations

While a standard 55-gallon fish tank is rectangular in shape, there are also variations in its structure that may affect the exact dimensions. Some fish tanks may be wider or taller than average, which can alter its overall capacity.

The shape of the tank can also vary, including hexagonal, cylindrical, and bowfront designs. These shapes often have the same volume or capacity as a standard 55-gallon fish tank, but their dimensions may differ. For example, a cylindrical fish tank may have a smaller footprint but a taller height.

Factors to Consider when Choosing a 55-Gallon Fish Tank

Factors to Consider when Choosing a 55-Gallon Fish Tank

When choosing a 55-gallon fish tank, it is important to consider several factors that may influence the size and type of fish that can be housed within it. The size of a fish tank will ultimately determine the number of fish that can be comfortably housed within it. A 55-gallon fish tank, for example, can support approximately 10 to 15 small fish, or 1 to 3 larger fish, depending on their size and species.

The dimensions of a fish tank also need to be considered in relation to the size and shape of the fish. The height of the tank may be a concern for some species, particularly those that require a lot of vertical swimming space. Likewise, some fish may require a tank with a larger footprint to accommodate their swimming patterns.

Other factors to consider when selecting a fish tank include the filter and lighting system, as well as the shape and layout of decorations within the tank. A well-chosen fish tank can provide an ideal aquatic environment for fish while also adding style and beauty to any room in the home.

Available Space in Your Home

55 gallon fish tank size

One of the main factors that should be taken into consideration when purchasing a 55-gallon fish tank is the available space in your home. It is important to measure the area where the tank will be placed to ensure that it fits perfectly. Keep in mind that a 55-gallon fish tank can be quite large and heavy, so it is important to choose a strong and sturdy foundation that can hold the weight.

When measuring for space, it’s important not to forget about the accessories that go along with the tank. You’ll need a stand, which could add several inches to the height of the tank, and a hood, which could add a few inches to the length. Measuring the space carefully will ensure that the tank fits and all the accompanying equipment fits too.

You should also consider the room lighting when deciding where to place your tank. It is best to avoid placing the tank near direct sunlight, or in a room that is exposed to drastic temperature fluctuations.

Type of Fish

Types of Fish

The type of fish you plan to keep in your tank is another important consideration. Different fish require different living conditions based on their size, behavior, and water temperature. Be sure to research the types of fish you plan to keep so you can ensure that you create the right environment in the tank.

For example, if you plan to keep large fish, such as Oscars or Cichlids, you should choose a tank that is deeper rather than longer. Larger fish need more space to swim around, so a deep tank will provide more swimming space than a long shallow one. On the other hand, if you plan to keep small fish, a long shallow aquarium would be best as this will give them enough space to swim around.

It’s also a good idea to plan the number of fish you would like to keep. Overcrowding the tank can lead to aggression among fish, diseases, and even death. Always make sure to follow the rules of thumb concerning the number of fish per gallon as different species require different space to live.



The price of a 55-gallon fish tank varies based on the brand, material, and features. While it’s important to buy the best possible tank for your fish, it’s also important to consider your budget.

The cost of the tank is not the only cost to be considered as accessories also add up. These include a filter, heater, lights, and decorations. You might also need to purchase water test kits to monitor the water quality in the tank. And, not to mention, the cost of the fish themselves.

It’s important to set a budget before you begin the process of purchasing a fish tank so you can pick the perfect tank and accessories that meet your requirements without breaking the bank.


Choosing a 55-gallon fish tank requires taking into account several factors such as available space, the type of fish you plan to keep, and your budget. By taking the time to consider all these factors and doing proper research, you can ensure that you provide a safe and healthy environment for your fish to thrive in.

Compatibility with Fish Species

55-gallon fish tank

A 55-gallon fish tank is a popular choice for both beginners and experienced aquarists. It offers enough space for a variety of fish species, but not all of them are compatible with each other. Therefore, it is important to understand which fish species are suitable for a 55-gallon fish tank, and which ones should be avoided.

The first thing to consider when selecting fish for your 55-gallon fish tank is their adult size. Fish that grow too large for the aquarium will suffer from stunted growth and experience health problems. For example, fish such as the red tail shark, comets, and koi are not suitable for a 55-gallon fish tank as they grow large and need more space to move around.

Another important factor to consider is the temperament of the fish. Some fish are peaceful and can coexist with others without any trouble, while others are aggressive and territorial, which can lead to fights and stress. Examples of peaceful fish that are suitable for a 55-gallon fish tank include tetras, mollies, platies, guppies, dwarf gouramis, and corydoras catfish.

On the other hand, aggressive fish species such as cichlids, betta fish, and angelfish should be avoided in a 55-gallon fish tank. These fish require plenty of space and can become territorial towards other fish. They might also attack smaller fish and cause injury or death.

It is also important to consider the swimming level of the fish. Some species prefer to swim near the top of the water, while others prefer the middle or the bottom. Having a variety of species that occupy different levels of the aquarium can create a more interesting and engaging environment for both the fish and the aquarist.

In conclusion, a 55-gallon fish tank is a fantastic choice for keeping a variety of fish species. However, it is important to select fish that are suitable for the tank size, temperament, and swimming level. By doing so, you can create a flourishing and harmonious underwater ecosystem that will provide endless hours of enjoyment and learning.

Accessories for 55 Gallon Fish Tanks

55 Gallon Fish Tank Accessories

A 55-gallon fish tank is a sizable tank that can accommodate numerous fish species. To ensure that the fish inside the tank thrive and live comfortably, various accessories should be used. Here are some of the common accessories that are used with 55-gallon fish tanks:

1. Filters

Fish Tank Filters

Fish produce waste, and this waste can be harmful to the fish. Filters help to remove the impurities, debris, and excess food from the tank’s water. They also help in the breakdown of harmful chemicals that can be released in the water. There are various types of filters, such as internal filters, external filters, power filters, and canister filters. Each type of filter comes with its unique way of cleaning the water, but all serve the same purpose.

2. Heaters

Fish Tank Heaters

Heaters help regulate the water temperature in the 55-gallon tank. Most fish species require specific temperatures to thrive, and without the right temperature, the fish become stressed and eventually become sick. A heater can help maintain the right water temperature, especially in cold areas. There are different types of heaters such as submersible, immersible, and in-line heaters. It is important to choose the right heater for your tank based on the size, the type of fish, and other factors.

3. Lighting Systems

Fish Tank Lighting

Lighting systems help to mimic the natural environment of the fish and plants in the tank. They also help in regulating the circadian rhythm of the fish. In addition, they support the growth of plants and stimulate the appetite of fish. There are different types of lighting systems such as LED lights, fluorescent lights, and incandescent bulbs. It is important to choose the right lighting system, depending on the type of fish, plants, and budget.

4. Air Pump

Fish Tank Air Pump

An air pump ensures that a sufficient amount of oxygen is supplied to the fish in the tank. An air pump works by introducing air into the water and oxygenating it. It also helps in maintaining the water’s pH level and ensuring proper filtration. There are different types of air pumps, including diaphragm pumps, piston pumps, and linear air pumps. It’s important to choose the right air pump depending on the size of the tank and the type of fish.

5. Decorations

Fish Tank Decorations

Decorations such as rocks, caves, plants, driftwood, and other objects provide the fish with shelter, hiding places, and a sense of security. Plants also help in oxygenating the water, provide a natural habitat for the fish, and assist in filtering the water. Decorations can also enhance the aesthetics of the tank and add a new dimension to the fish’s environment.

Choosing the Right Location for Your 55 Gallon Fish Tank

55 gallon fish tank dimensions

Before purchasing a 55-gallon fish tank, it is important to consider the location where it will be placed. You will need to choose a sturdy and level surface that can support the weight of the tank, which will be approximately 625 pounds once it is filled with water, gravel, and decorations. Make sure the location is not exposed to direct sunlight or extreme temperatures which can affect the temperature of the water and lead to problems for your fish.

Setting up the Tank

55 gallon fish tank setup

When setting up your new 55 gallon fish tank, start by pouring a layer of washed aquarium gravel on the bottom. For a 55 gallon tank, it is best to use between 60-100 pounds of gravel. Next, fill the tank with dechlorinated water and install a high-quality filtration system to keep the water clean and clear. It is also a good idea to install a heater to maintain a consistent water temperature for the fish.

Choosing the Right Fish

55 gallon fish tank fish

When selecting fish for your 55-gallon tank, consider the size of the fish and their compatibility with each other. It is best to choose a mix of fish that occupy different levels of the tank, such as bottom dwellers and middle-to-top swimmers. Research the specific requirements and behavior of each fish to ensure they are compatible with each other and have enough space to swim and grow.

Feeding Your Fish

55 gallon fish tank feeding

For best results, feed your fish small amounts of food two to three times a day. It is important not to overfeed your fish as this can lead to poor water quality and health problems for your fish. Choose fish food that is appropriate for the species of fish you have and consider adding supplements such as frozen or live food to their diet for variety.

Cleaning Your Tank

55 gallon fish tank cleaning

To maintain a healthy environment for your fish, it is important to regularly clean the tank. This includes performing partial water changes of at least 25% every two weeks and vacuuming the gravel to remove any debris and waste. It is also recommended to clean the filter monthly and replace the filter media as needed.

Monitoring Water Parameters

55 gallon fish tank water parameters

To ensure the health of your fish, it is important to monitor the water parameters regularly. Use a water testing kit to check the levels of ammonia, nitrite, and nitrate, as well as the pH and water hardness. Ideally, your tank should have a pH between 6.5-7.5 and ammonia and nitrite levels at zero. If any of these levels are off, take action to correct them promptly to avoid health problems for your fish.


Fish Tank Conclusion

In conclusion, choosing a 55-gallon fish tank can be an exciting and fulfilling experience for both novice and experienced aquarists. Here are some key takeaways from the article:

1. When selecting a 55-gallon fish tank, consider the material, design, and features that will best suit your needs and preferences.

2. Ensure proper sizing by measuring the available space and understanding the actual dimensions of the tank you are interested in.

3. Set up the tank properly, taking into account factors such as filtration, lighting, and decoration.

4. Choose fish species that are compatible with each other and the tank environment, and ensure proper care and maintenance to keep them healthy and thriving.

5. Avoid overstocking the tank, as this can lead to a variety of problems, including poor water quality, stress among fish, and disease outbreaks.

6. Monitor the tank regularly and address any issues promptly to prevent them from becoming major problems.

7. Finally, don’t be afraid to experiment and have fun with your tank. The possibilities for customization and creativity are endless, and you may find that aquarium keeping becomes a lifelong hobby that brings you joy and satisfaction.

Overall, a 55-gallon fish tank can provide a stunning visual centerpiece for your home or office, as well as a rewarding hobby that offers numerous benefits for your health and well-being. With careful planning, preparation, and ongoing maintenance, you can create a beautiful and healthy aquatic ecosystem that will delight and fascinate you and your guests for many years to come.

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