New 90 gallon aquarium [sizes, dimensions & weight]

Estimated read time 11 min read

Welcome to the world of fishkeeping, where the size of your aquarium can make all the difference in creating a thriving aquatic ecosystem. 

Choosing the right aquarium size is a pivotal decision that impacts the health and happiness of your fishy friends. In this article, we’ll delve into the fascinating realm of fishkeeping and shed light on the importance of selecting the perfect tank size.

Our central focus will be the impressive 90-gallon fish tank.

How Big Is A 90-Gallon Fish Tank

The 90-gallon tank typically measures about 48 inches in length, 18 inches in width, and 24 inches in height, giving it a generous surface area for aquatic plants and fish to thrive.

Table of Contents

Aquarium Size: A Key Consideration

A. Importance of selecting an appropriate aquarium size

Aquarium size is more than just an aesthetic choice; it’s a critical factor that influences the well-being of your aquatic pets. Novice fishkeepers might opt for smaller tanks to begin their journey, while experienced enthusiasts often seek the challenges of larger tanks. But where does the 90-gallon fish tank fit into this spectrum of choices?

Understanding the 90-Gallon Fish Tank

A. Defining the 90-gallon fish tank

The 90-gallon fish tank is a substantial container for your underwater world. It boasts a capacity of 90 gallons of water, providing ample space for aquatic life. But what are the actual aquarium dimensions of this tank, and what are the options when it comes to its different shapes and styles? Let’s dive deeper into its features.

B. Actual aquarium dimensions of a 90-gallon tank

The 90-gallon tank typically measures about 48 inches in length, 18 inches in width, and 24 inches in height, giving it a generous surface area for aquatic plants and fish to thrive.

Benefits of a 90-Gallon Fish Tank

A. The perfect size for a variety of fish

One of the benefits of a 90-gallon fish tank is its versatility. This size strikes a balance between smaller and larger tanks, making it ideal for a diverse range of fish species. Whether you’re into small fish like neon tetras or looking to house larger fish like the magnificent yellow tang, a 90-gallon tank provides enough room for them to thrive.

B. Providing plenty of room for fish and decorations

In a 90-gallon tank, you’ll have plenty of room to create an underwater paradise. The spacious dimensions allow for a multitude of aquarium plants and colorful live rock to adorn your aquatic environment. Your fish will enjoy the extra swimming space, and you can get creative with your aquascaping.

C. Ideal for both freshwater and saltwater aquariums

Whether you’re into freshwater or saltwater fish, the 90-gallon aquarium is up for the challenge. It provides a stable environment for both ecosystems, allowing you to explore the beauty of saltwater aquariums or maintain a thriving freshwater fish tank.

Managing a 90-Gallon Fish Tank

A. Water volume and weight considerations

With its substantial capacity, a 90-gallon tank holds a considerable gallon of water, which translates to a significant water weight. It’s essential to ensure that your aquarium stand and the floor it rests on can support this weight safely.

B. Filtration options

Maintaining water quality is paramount in fishkeeping. Consider using canister filters and protein skimmers to keep your 90-gallon tank’s water pristine. Some enthusiasts also opt for gravel filters or sump systems to enhance filtration efficiency.

C. Ensuring the right type of tank trim

When choosing your 90-gallon tank, pay attention to the trim type. Different trims can affect the tank’s aesthetics and functionality, so select the one that suits your preferences.

D. Air pumps and return pipes for water circulation

Proper water circulation is vital for oxygenating your tank and maintaining a healthy environment. Air pumps and return pipes help ensure adequate water movement in your 90-gallon tank.

Practical Tips for Setting Up a 90-Gallon Fish Tank

A. Steps to set up a new 90-gallon aquarium

Setting up your new aquarium involves several steps, including cleaning, adding substrate, and installing filtration systems. Follow a systematic approach to ensure a smooth start for your aquatic community.

B. Cycling the tank and quarantine tank usage

Cycling your tank is a crucial step to establish a stable environment. Consider setting up a quarantine tank for new arrivals to prevent potential diseases from affecting your established community.

C. Choosing the right type of fish

Selecting the right type of fish is essential for harmonious coexistence in your 90-gallon tank. Research the compatibility and care requirements of different species before adding them to your aquarium.

D. Aquarium plants and live rock for decoration

Enhance the aesthetics and water quality of your tank with carefully chosen aquarium plants and live rock. These additions not only look beautiful but also contribute to the overall health of your aquatic ecosystem.

E. Maintaining water quality and regular maintenance

Consistent maintenance is key to keeping your 90-gallon tank thriving. Regularly monitor water parameters, conduct water changes, and clean filters to ensure a healthy environment for your fish.

Finding the Right 90-Gallon Fish Tank

A. Local fish stores and their offerings

Local fish stores often carry a variety of aquariums, including 90-gallon tanks. Visit your nearest store to explore your options and seek expert advice.

B. Online options and the convenience of free shipping

Online retailers provide a wide range of aquariums, including 90-gallon fish tanks, with the added convenience of free shipping. Take advantage of this option for a hassle-free purchase.

C. Standard sizes and availability in the United States

In the United States, standard sizes for aquariums are widely available, making it easier to find the perfect 90-gallon tank to suit your needs.

D. Different trim types and glass tanks

When shopping for a 90-gallon tank, consider the different trim types and materials available, such as glass aquariums, to find the one that aligns with your preferences.

E. Exploring tank pictures for inspiration

Before making your final decision, explore tank pictures online to gain inspiration for your aquarium setup. Seeing other hobbyists’ creations can help you visualize your dream tank.

Small Tanks vs. Larger Tanks: The General Rule

A. Small Tank Considerations

When deliberating over the size of your aquarium, it’s essential to keep the general rule in mind. Small tanks are often favored by beginners due to their manageable size and lower water volume. However, their limited space may not provide the plenty of space needed for certain species or particularly large fish.

B. Bigger Tanks for Advanced Fish Keeping

Experienced hobbyists tend to gravitate toward bigger tanks as they offer more flexibility for stocking various species and creating breathtaking aquascapes. This large size allows for a wider array of options, including the possibility of keeping more colorful fish.

Determining the Right Tank Size: The Rule of Thumb

A. The Rule of Thumb for Inch of Fish

As a rule of thumb in fish keeping, it’s often suggested that you allocate one inch of fish per gallon of water. This calculation takes into account the total water capacity of the tank, which is especially relevant when considering mid-sized tank options like the 90-gallon aquarium.

B. Tailoring Tank Dimensions to Your Needs

Different fish species have varying space requirements, and your choice of tank should align with these needs. By understanding the aquarium dimensions of a tank, you can ensure that your fish have plenty of room to swim and thrive.

Exploring Saltwater Fish Tanks

A. The Appeal of Salt Water Aquariums

For those with a fascination for the ocean’s beauty, a saltwater fish tank is a good idea. These tanks replicate the allure of the sea, housing stunning marine life in various sizes. The capillary action of saltwater adds a unique dynamic to the ecosystem.

B. Stocking Options in Saltwater Aquarium Setups

Saltwater aquariums offer a diverse range of stocking options. Whether you dream of a vibrant gallon reef filled with colorful coral and fish or a more minimalist approach, there are types of fish tanks to suit your preferences.

The Importance of Tank Dimensions and Water Volume

A. Tank Dimensions and Water Weight

When selecting a tank, it’s crucial to consider both the tank dimensions and the weight of the tank. These factors determine if your chosen location can support the tank’s total water capacity and ensure the safety of your aquatic environment.

B. The Easiest Way to Measure

To accurately gauge your available space, use a tape measure to assess the dimensions of the area where your new tank will be placed. This easiest way to measure ensures a snug fit and avoids potential issues down the road.

Shopping for Your Tank: Local Fish Stores vs. Online Retailers

A. Local Fish Stores: Personalized Service

Local fish stores offer the advantage of personalized advice and the opportunity to see tanks in person. You can also purchase accessories like an air pump or protein skimmer and consult with experts about the right fish for your tank.

B. Online Retailers: Convenience and Options

Online retailers provide the convenience of shopping from home, often with the added perk of free shipping. They offer a wide range of tank sizes, including the popular 20-gallon tank and 75-gallon fish tank, making it easy to find the best size for your needs.

With these additional sections, the article further explores the nuances of aquarium size selection, the rules that guide it, the appeal of saltwater fish tanks, the importance of tank dimensions, and where to find your ideal 90-gallon fish tank.


In conclusion, a 90-gallon fish tank offers an exciting balance between smaller and larger tanks, making it an ideal choice for both novice and experienced fishkeepers. Its versatility, water volume, and ample room for decorations and fish make it a fantastic option for creating stunning underwater landscapes. Whether you’re interested in freshwater or saltwater fish, the 90-gallon tank is a manageable size that can accommodate your aquatic dreams. So, as you embark on your fishkeeping journey, remember the importance of choosing the right tank size, and consider the many benefits that a 90-gallon fish tank can bring to your aquatic world. Happy fishkeeping!

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