65 Gallon Hexagon Aquarium

65 Gallon Hexagon Aquarium

A 65 gallon hexagon aquarium offers a unique way to house and display aquatic inhabitants and allows for a more viewable area of the fish inside. Hexagonal aquariums are perfect for homes or offices and can be purchased at most pet stores.

In this article, we will discuss whether or not hexagonal fish tanks are good, what the dimensions of a 65 gallon hexagonal tank are, and what other sizes hexagonal tanks come in. Additionally, we will cover how many gallons a hexagon tank can hold as well as whether or not you can keep coral in a hexagonal tank.

Are Hexagonal Fish Tanks Good?

Hexagonal tanks are aesthetically pleasing and can offer a good view of the tank inhabitants from a multitude of angles. However, you need to be careful about selecting the type of fish to put in your hexagonal tank.

Hexagonal tanks tend to be taller rather than wider which could introduce an issue if you put too many fish in the tank. With less surface area to allow for oxygen exchange at the top, oxygen is even more limited than in a wider rectangular tank. Instead of choosing the number of your tank inhabitants strictly by volume, you may want to base it on the dimensions of the tank.

Even with less room to breathe, hexagonal fish tanks can provide a unique opportunity to add variety to your aquarium by choosing species that occupy different levels of the water column. If configured carefully and correctly, you could create an efficient tank system that utilizes all of the tank space in a unique way.

What Are the Dimensions of a 65 Gallon Hexagonal Tank?

Hexagonal tanks occupy more height than they do width or length. This varies from the typical rectangular tank whose greatest dimension is its length. Hexagonal tanks that hold about 65 gallons of water measure approximately 28 inches in length, 25 inches in width, and 30 inches in height.

In comparison, a common 65 gallon rectangular tank measures 36 inches in length, 18 inches in width, and 25 inches in height. It’s easy to see how the dimensions of the hexagonal tank create a more compact space even than the rectangular tank even though they both hold the same volume of water.

When filled completely, both tanks weigh between 750 and 775 pounds. The hexagonal tank is more suited to smaller spaces such as corners or tight rooms, while the rectangular tank needs a lot of space in order to set it up accordingly.

What Sizes Do Hexagon Fish Tanks Come In?

Hexagonal fish tanks typically come in four standard sizes with the 65 gallon tank being the largest. The smallest tank measures at 14 inches in length, 12 inches in width, and 18 inches in height.

The next size up is 18 inches in length, 16 inches in width, and 20 inches in height. The second largest tank measures 23 inches in length, 20 inches in width, and 24 inches in height.

None of these sizes are terribly large. In fact, the smallest two are perfect for desks or bedside tables to house maybe one or two fish. Of course, there is also the option of customizable sizes for hexagonal aquarium tanks which can come in an infinite combination of dimensions.

Larger hexagonal aquariums that can hold 75, 95, and even 125 gallons are available for purchase at most pet stores, although the smaller tanks are far more common.

How Many Gallons Does a Hexagon Tank Hold?

The most common sizes for hexagonal tank volumes are 10, 20, 35, and 65 gallons. However, you can find smaller and much larger sizes as well. There are 2, 5, and 8 gallon hexagonal tanks perfect for one small fish to live in. There are also 75, 95, and 125 gallon tanks to house entire fish communities.

The larger tanks are better suited for office spaces and open areas so that they can receive the appropriate amount of light and attention. No matter what size hexagonal aquarium you choose, these tanks can be extremely heavy when fully filled. Even a 10 gallon tank will weigh over 100 pounds.

Most of the larger aquarium tanks cannot be moved once they are filled. An 125 gallon hexagonal tank can weigh as much as 1400 pounds when it is full of water and that doesn’t take all of the equipment, décor, and inhabitants into account! There are many options for hexagonal aquarium sizes; choose the one that best suits your space.

Can I Keep Coral in a Hexagon Tank?

You can keep coral in an appropriately sized hexagonal tank. However, there are a few things you need to consider before setting up your reef. First, you need to make sure that you get a large enough tank to accommodate all of the necessary equipment for a saltwater setup.

Secondly, coral are bottom dwellers and hexagonal tanks don’t provide a lot of horizontal space. You will be more limited in the number of coral colonies you can house in a hexagonal tank compared to a rectangular tank. However, there is no reason you can’t get creative.

You may be able to build levels within the hexagonal tank to allow for multiple coral colonies to thrive. The biggest factors to keep in mind are the ability of the coral to survive at different levels in the water column and eliminating competition for space.


Hexagonal fish tanks are a unique way to keep your aquarium fish and display a colorful aquatic ecosystem. However, they do present some challenges to keep in mind so that you don’t sacrifice the health of your fish community for aesthetics.

Balance out species that occupy all levels of the water column since hexagonal tanks have more height than length. You may need to keep less fish than you would in a rectangular tank and coral reef configurations will look very different than in a traditional tank.

Take on the challenge and set up your hexagonal tank today!