The Best 125 Gallon Aquariums of 2021


Aquariums are always a nice touch to a home or office. It is a soothing and tranquil masterpiece and a lot of folks are really into this hobby and experience. Larger aquariums, for example, that with a capacity of 125 gallons will always be the center of attraction on any room. Combined with your choice of fishes and aquascaping, you can come up with a piece of art that will be your pride and joy. It is a good thing that today, there are a lot of resources that you can consider and purchase to help you make your dream fish tank a reality. You just need to do a deep info searching and for sure, you will come across the best 125 gallon aquariums.

What is the Best 125 Gallon Aquarium

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Top 7 Best 125 Gallon Aquariums Reviews

1. Clear-For-Life 125R Rect PARENT


This acrylic 125 gallon Clear-For-Life aquarium has a clear back panel and the corners are rounded which makes it aesthetically beautiful. You will like that unlike glass, this is a stronger, safer and lighter. Its walls and sides are very clear that you can enjoy the vibrancy and colors of your aquatic residents. This is an ideal choice for saltwater, freshwater, planted and reed aquariums.

This aquarium comes in four colors of clear, black, blue, and sapphire blue black. You will get your money’s worth with this one since it is an all-in-one system that is effective and easy to use It also comes with a built-in corner overflow, and a high capacity wet-dry filter. Everything you need to install it comes with the package.

One drawback for this aquarium is it is pre-ordered and are custom built so aside from the shipping wait time, you need to give the manufacturer 2 more weeks to complete it. This is the 125 gallon fish tank that you’ll ever need and want. As the name suggests, you will have a clear for life aquarium that you can always enjoy.


  • 40% clearer than the standard tank
  • Stronger, safer, and lighter than glass
  • Easy to use and easy installation
  • 4 available colors
  • All needed installation hardware is included


  • 2 weeks waiting period plus shipping time

2. Perfecto Marineland Fish Aquarium 125 Gallon Tank


The 125-gallon Perfecto Marineland Fish Aquarium is an efficient overflow tank that has the brand’s water drift technology. You will be impressed with its flawless circulation and its ability to make the most out of the water drift to the main filtration system while maintaining a minimal to almost nothing drift noise.

With a product dimension of 72 x 18 x 22 inches, this tank is silicon sealed and the front section is detachable which makes cleaning more convenient. Overall, this is an easy to use aquarium and is a perfect holding place for your fishes, plants, and reefs.

One major drawback though is this does not come with the filter, media and plumbing hardware needed to set up the aquarium.


  • Water drift technology
  • Ease of use
  • USA manufactured
  • Silicon sealed to the back-corner walls
  • Front section is removable


  • Filter, media and plumbing hardware needs to be sold separately

3. Clear-For-Life UniQuarium 125R Rect Parent


Looks can be deceiving and this is the exact case for the Clear-For-Life Uniquarium 125 gallon. It is simple sans the fancy frills but there’s more to it that meets the eye.

This aquarium has an awesome filtering system that can help you save tons of money. It is easy to set up and the maintenance required is one of the easiest on the market.

With a dimension of 60” x 18” x 24”, you can accommodate a lot of various fishes. You can also let your creative juices flow as you aquascape your tank.

One disadvantage of the Clear-For-Life UniQuarium is it requires a stand and this needs to be purchased separately. This is one of best choices you can have when you want to upgrade your fish tank and explore more about the different kind of fishes and themes for your tank.


  • Integrated filtration system
  • Simple design
  • Easy to install
  • Maintenance is hassle free
  • Perfect for aquascaping


  • A stand is needed and needs to be purchased separately

4. SC Aquariums 120 Gallon Starfire Glass Aquarium


The SC Aquarium is one of the popular fish tanks if you want to go on larger in capacity. This is built in the US and its main advantage is its starfire glass. The advantage of using this glass is it is easier to see using the naked eye. With your vibrant collection of colored fishes against a black background, you will achieve that realistic aquamarine environment

This tank comes with a 3 front panel made of low-iron glass and pipe parts. It is made of silicone and you can conveniently remove the black background if you want to make changes in the interior design.

One downside of this otherwise great aquarium is you really need to make room for it and you need to get a stand for it because it doesn’t come equipped with one. This is the ultimate dream for an aquarist who wants more than the calm that the fishes can bring about. This is a great avenue to let loose your creativity.


  • Protected with Euro-bracing
  • Starfire glass
  • Integrated built in overflow box
  • Black background can be removed conveniently
  • Built in the USA


  • A stand is needed and needs to be purchased separately

5. JAJALE Aquarium 135 Gallon with Fish Tank Stand


A definite stand out because of its style, this spacey and cozy aquarium fish tank is made of premium quality permeable glass. It is proven to be 4 times more resistant than the typical glass. You will be impressed with its ultra-transparent with 99% light transmission which makes watching this small marine world a pleasant experience.

Sturdy, it is wear-resistant and is also impervious to acid and alkali. What’s more is when you received the tank; it comes with a spiral silencer that is meant to be placed in the down pipe to ensure that the tank is quiet. It has modern water pumps and filtration tanks that make maintenance simple.

One major consideration is the price as it is more expensive compared to its competitors. It is very true that you get what you pay for and for this case, you can say that this tank is worth it.


  • Surface is hard
  • 4x more resistant to regular glass
  • Resistant to acid and alkali
  • Comes with water pumps and filtration tanks
  • Comes with a stylish cabinet


  • It is expensive

6. SC Aquariums 135-Gallon Starfire Aquarium


A popular choice for seasoned hobbyists and aquarists, this aquarium with a capacity of 135 gallons boasts the standard SC starfire glass aquarium in all three panels. The back panel also shared the completely removable black background which you can change anytime.

It has a dimension of 36 x 36 x 24 inches and has a 15mm rimless integrated center overflow. You will also benefit from its compatibility with Herbie plumbing. It is already conveniently drilled with 3 holes inside the overflow box. Additionally, the plumbing kit is already included when you get this making the installation easier.

Just like the larger aquariums from this brand, this one also needs a stand. You will enjoy creating a marine world out of your imagination and making it a reality with this aquarium. It is a purchase that is worth your money.


  • Starfire glass on all three panels
  • Black background that can be removed
  • 15 mm rimless built-in center overflow
  • Built in overflow
  • Herbie plumbing compatible


  • Stand needs to be purchased separately

7. Perfecto 125 Gallon Hexagon Aquarium Tank


An aquarium with a 125-gallon capacity is a stand out already. Make it a hexagon shaped aquarium and it will 100% demand attention. The Perfecto 125-gallon hexagon aquarium with oak trims can powerfully filter up to 50-gallon aquariums. The filter is highly efficient that it can complete the job of 2 filtration systems. You will like that it can effortlessly transform from a water polisher to a non-stop mechanical / chemical filter.

This fish tank is highly durable and easy to use. The shape alone, being hexagon adds uniqueness to it. The shape can be considered as both a blessing and a curse because you’ll need the stand to be customized especially for it. Additionally, with the fish tank’s not so usual shape, you must strategically find a spot for it in your home or office.

This aquarium is a great choice. Its unique shape will pique the interest of your family and friends and will entice them to have a second look on your fish and reef collection.


  • Durable and quality
  • Ease of usage
  • 250 GPH
  • Filters up to 50-gallon aquariums
  • Can do the work of two filtration systems


  • Allotted space needs to be fit to the hexagon shape

125 Gallon Aquariums Buying Guide 

A 125-gallon fish tank is surely not the cheapest but it is one of the tanks that can offer you freedom, versatility and excitement. This tank size can allow you to keep larger fishes like the lucky and peaceful Koi fishes. Aquarists and hobbyist normally start with a smaller 10-20 gallons fish before venturing to these larger aquariums. If you are ready to take this step, then here is a quick buying guide for you.

What do you have in mind for your tank? Before splurging, you must have a detailed outline of your vision. The tank can be home to various water creatures or it can also be just for a single fish. The plants and other aquarium necessities, do you already have them or will it be part of the shopping list? Also, you must consider the spot where you want this gallon to be situated.

Do you have the right equipment? This massive size is for no beginners but it can still be challenging for seasoned ones. This size can be home to some exotic and special oddball fishes and plants and it would require a good eye in aquascaping. You also must consider here the filter and the heater that you need for the tank. The output capacity should be enough because even if it is working but if it is not potent enough, it will still be inefficient. There are also the lights, pumps, and even an aquarium vacuum that needs to be considered.

Can you commit to it? This is an easy question for those with creative passion for fishes. You must be ready to investa portion ofyour timewith creating your aquaworld the way you want it. You also must consider here the costs and effort for the maintenance like the regular water renewals, removing the algae, among others. It won’t be easy but seeing your 125 gallon in all its grandeur is a sight to be behold.

What is a 125 Gallon Aquarium?


A fish tank with a 125-gallon size that usually comes in a rectangular shape is perfect for hobbyists who want the freedom of flexibility when it comes to stocking. A 125-gallon tank can be home to most if not all the fishes from your local pet shop. Large species and fishes that can grow up to 14 inches can contentedly swim around on this tank. Advanced fish breeders and enthusiasts can use a 125-gallon tank for a community of different fishes or just for a single specimen. A 125-gallon aquarium is not for beginners.

Types of 125 Gallon Aquariums 

Fish tanks with a capacity of 125 gallons can be classified according to its material; either glass or acrylic. It has been a long-time debate which one is the best as both are top choices. Both materials are clear and built to hold large amounts of water. Additionally, both are perfect in creating an aquatic world based from your preferences and theme.

For larger aquariums like a 125-gallon tank, acrylic is a better choice because of its weight. Glass is heavy on its own. Imagine a 125-gallon glass aquarium weighs 10 times more compared to one that is made from acrylic. It can be a painful and not so pleasant experience to move it around should you decide to redecorate. Without even the water, it is already massive.

Compared to glass, acrylic made aquariums especially for large ones are also stronger and more resilient to impact. Glass easily breaks or chips.

Another advantage of 125-gallon aquariums is its ability to be shaped. Glass is strong but it is also hard and brittle thus are usually just set in a rectangular shape. Aside from its rigid form, curved glass fish tanks also have issues with bending the light. The light being bent results to the fishes appearing to be smaller or bigger than reality. In contrary, acrylic can easily be shaped to whatever form you want. It is ideal for those who want their tanks to be customized and those aquarists that are into DIY projects.

These two types of 125-gallon aquariums based from the material are both winners. Each are smart choices but most seasoned aquarists who like to be creative would go for acrylic and the newbies with the glass type.

Why Do You Need 125 Gallon Fish Tank? 

You will need a 125-gallon aquarium if you want to explore your creativity and expand your already rich collection of fishes. Owning one may also lead you to discover and learn about new species and grow your current assortment.

If you want to make your larger fishes be more comfortable then upgrading to a 125-gallon tank is the first step in achieving this. Having enough space to swim around can make your fishes thrive and survive longer. You can have several medium sized fishes or large ones and still have enough space for plants and even reefs. Space will no longer be an issue and a crowded aquarium can be fatal to its residents. Aside from that, it is not too pleasant to look at because there’s so much going around that you can’t appreciate the beauty.

Additionally, a larger aquarium like this can give you the opportunity to try new designs and create a natural background for your marine world in a tank. You can make use of the versatility that a 125-gallon fish tank provides to make your aquascaping realistic and impressive.

At the end of the day, you will need a 125-gallon aquarium so you can grow your knowledge and skill when it comes to taking care of your collection. It will also be a test of your commitment on how far your passion brings you when you have a massive 125 to maintain.

Frequently Asked Questions


How much does a 125-gallon aquarium weigh?

A 125-gallon aquarium is considered as a large aquarium. It is heavy and massive. On an empty weight, it can tip the scale at 206 pounds and when you consider its filled weight, you are looking at a hefty 1206 pounds of mass. Note that these weights are the closest estimates because the type and thickness of glass used and the water type would also have an impact with the overall weight of the aquarium.

With its weight, you might have issues moving it to another location empty or not so you have to make sure that you are 100% decided on the position of your aquarium.

What size sump for 125-gallon fish tank?

A sump in an aquarium is usually placed behind, below, or on a support located above the tank. It is used as a filter and can also hold the unpleasant miscellaneous kits like protein skimmers and heaters from the naked eye. For a 125-gallon aquarium, a size of 30 inches by 12 inches by 16 inches should be good enough.

What are the dimensions of a 125 gallon aquarium?

The standard size for a 125-gallon aquarium is 72” by 18” by 21”.

What size heater for 125 gallon aquarium?

Your fish tank is the new and most likely permanent home of your various cold-blooded living beings that need the correct temperature to thrive and survive. The temperature of your aquarium directly impacts these animals’ ability to sustain their temperature so you must make sure that you provide heat and set it at the right temperature. The heating capacity or the heating power recommended for a 125-gallon aquarium would be two heaters each with a capacity of 250 or 300 Watts so it can evenly warm the whole tank.

What is the best fish for 125 gallon fish tank?

Due to its large capacity, you can a wide variety of fishes in your aquarium. It can be a unique tank with oddball fishes on it or perhaps different predator fishes in your 125 gallons. The best fish for this large tank would be those who are 10 to 14 inches long in length. It will give them room to swim comfortably in the tank. Always follow the rule of keeping one fully grown fish for every gallon of water.


Bringing home one of the best 125 gallon aquariums on the market and putting life and beauty on it step by step is any aquarist’s dream. Aquariums of these sizes require commitment, time, and lots of hard work and the result will always be satisfying. Watching your aquarium and getting lost in the beauty that you created can be an oddly satisfying feeling. It will be such a tranquil and relaxing way to end a stressful day or week. What’s more is you get all the credit for creating a small marine world that is well thriving and living. Buy a 125-gallon aquarium today!

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