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The Best 125 Gallon Aquarium – Top 5 Picks (2022) – AquariumStoreDepot


When it comes to aquariums, one of the first things you’ll hear is that bigger is better. But how big is too huge?

Larger tanks do necessitate more powerful equipment, which is more expensive, but parameters are easier to regulate, giving you more time to enjoy the natural ecosystem that occurs in your tank!

Continue reading to learn if a 125-gallon aquarium is perfect for you and which options are best for you.

Comparing aquarium systems can be tricky because they all appear to be the same yet have slightly varying size and associated accessories. To make it easier to choose, we ranked 125 gallon aquariums by price, user rating, quality, and included accessories.

Criteria for Evaluation (How These Aquariums Made The Cut)

Features – Aquariums of this size are typically more than just an aquarium. I appreciate all-in-one solutions because they take out a lot of the guessing. Build quality — check for aquariums that have been well-made. They should have a solid warranty and reputation if they are rimless. They should have proper braces and quality reviews if they aren’t already. A 125 gallon tank can be 4 or 6 feet in length.In general, the shorter shape will provide better scaping dimensions and will be less expensive in terms of equipment due to lighting and pump costs. In general, the lengthier shape is preferable for fish. Candidates for the 125 Gallon Fish Tank.

Top 5 Aquariums for a 125 Gallon Aquarium (2022)

1. Red Sea Reefer 425 XL

For anyone seeking for a saltwater aquarium, the new Red Sea Reefers offer a superb all-in-one system.

The Red Sea Reefer 425XL is a top-of-the-line rimless aquarium featuring a sump and overflow system. The aquarium is credited with igniting the ready-to-run frenzy in the saltwater tank hobby. It’s intended to be used as a reef tank. Red Sea takes great pleasure in their production process.

This 425 XL type is wider than conventional reefer models, allowing for additional landscaping space. The pipe has already been built for you and does not need to be glued. The sump is also quite efficient.

The ATO reservoir is placed on top of the sump. This saves space and leaves plenty of area on the other side of the cabinet to mount and store your gear. Anyone who has maintained a high-level reef tank understands how gadget-obsessed we can become when it comes to attaching equipment for that great look.

The Red Sea Reefers are pricey, but they look amazing and come with everything you need to get started.

The benefits of Red Sea Reefers include a strong brand name.

The ATO Container saves space and is simple to assemble. However, the price is a disadvantage.

It’s only for reef tanks.

2. SC Aquariums 120

While not a 125 gallon tank, the SCA is the ideal size for a 4 foot long tank. It’s 24 inches tall and broad, so there’s plenty of room for scaping and fish.

SC Aquariums is well-known among reefers as a value-for-money ready-to-run aquarium. Low iron aquariums are clearer than standard bracing tanks and include with an overflow and plumbing equipment to get you started. They are frequently far less expensive than major brands like Red Sea and Waterbox.

The aquarium is the only variant in the link. The stand and sump are also available as a kit from SC. The sump is a rimless three-stage sump, and the cabinet is similar to the Monterey Stands from Marineland.

SC Aquariums is a tiny business, and the proprietor, Steve, is dedicated to providing excellent customer service. When you buy from SC, you’ll feel like you’re dealing with a person rather than a corporation. Their customer support has a good personal touch to it. You may also connect with other business owners on Facebook.

Overall, if you’re looking for a ready-to-run aquarium, this is an excellent affordable alternative. Many reefers have put these tanks to good use and created fantastic reef tanks as a result. It’s impossible to go wrong with these!

The benefits and drawbacks of SC Aquariums are as follows:

The benefit is that

  • For a reef-safe tank, this is a good price.
  • Customer service with a good reputation in the industry
  • The downside is that the cabinet is not rimless and is only available in black.

3. UNS 120U

The UNS 120 is a rimless aquarium developed specifically for freshwater aquascapers.

If you’re seeking to build a large aquascape aquarium, UNS is the place to go. UNS aquariums are among the finest rimless aquariums available today. Their glass is put together with high-grade silicone and has a world-class production process with 45 degree precision cut mitered edges. The glass is 91 percent Diamant glass with a low iron content. Commercial applications, such as office buildings and restaurants, call for this glass.

This type is a 4 foot aquarium with a height and width of about 24 inches. This is the ideal width and height for aquascaping, as it allows for a large number of schooling fish or larger fish such as Angelfish to be included in the aquascape. The clear background also looks better in a planted tank than a reef ready system, which typically has a dark background.

If you’re searching for a saltwater setup, this tank isn’t the ideal option, and the price can be high. If you want a large aquascape tank, though, this is the one to get.

The advantages and disadvantages of UNS 120 are as follows:


  • Obtain a high-quality background


  • Pricey
  • It’s best for freshwater.

4. Planet Aquariums 125

Prefabricated tanks with a sump and an overflow are known as Plant Aquarium Stands. Designed and manufactured in the United States of America!

Aquariums of this type can be purchased in local fish stores. These are made by Planet Aquariums, and they frequently cooperate with local fish stores to develop high-quality reef-ready tanks. They’ve begun selling online recently due to the pandemic. Their cabinets are made in the United States and are available in a wide range of colours.

This is a rimless tank with a bean animal drain and a slender overflow design. In a reef-ready package, the sump is one of the best. The Tideline sump is a high-end arcylic aquarium sump with a lot of built-in wow factor. They are built for 7′′ filter socks and have a three-stage sump that can adjust for water height.

Going to a Planet Aquarium is a fantastic deal in terms of the total package. However, because it’s a high-end item, it’s still beyond of reach for many reefers. It’s great that you can now order them online. When you don’t have to go to a local fish store to buy one, it relieves a lot of the sales pressure.

The advantages and disadvantages are as follows:


  • There are numerous cabinet possibilities.
  • Design with a slim overflow
  • Made in the United States of America


  • Expenses are high, and shipping takes a long time.

5. Top Fin 125

This 125 is PetSmart’s low-cost option. It’s one of the greatest new offers you’ll find at this size.

If you’re looking for a low-cost 125 gallon tank, Top Fin’s product might be just what you’re looking for. This is one of the most affordable tank layouts available at this size. It’s a 6-foot-long tank with lots of room for bigger fish.

When properly configured with the appropriate filter, the cabinet is a decent value with this package. I dislike the fact that there is a shelf in the middle since it reduces the amount of room available for larger canister filters or a sump. The majority of the time, you want your storage to be inside the cabinet, not outside. It’s a lovely decorative addition, but it’s not practical for a fish tank.

The price is unbeatable, and you can get it right away. However, the cabinet isn’t the best. It’s composed of particle board, which isn’t a smart long-term choice if you have a saltwater tank or a sump. For anything this enormous, I’m not a fan of rimmed tanks either. It’s a setup to consider if you’re on a budget of this magnitude and want to pick anything up locally.

The advantages and disadvantages are as follows:


  • Excellent value for money
  • Tank with a 6 foot length
  • Locally, it’s simple to find


  • Tank with a Rim
  • Cabinets of poor quality
  • Cabinet space is limited.

Buying a 125 Gallon Aquarium

Choosing the fish for your 125 gallon tank can help you determine how much you’ll spend and what kind of equipment you’ll need to run and manage it.

The demands and requirements of a goldfish and a saltwater tang are vastly different. Freshwater vs. saltwater tanks, or planted vs. non-planted tanks, are examples of this. Visit venues such as forums or an aquarium club.

Budget Issues

When it comes to keeping an aquarium, money is always a consideration. However, the cost disparities between 2 and 4 foot long tanks are significant. Going from a fish-only tank to an aquascape or reef tank necessitates a significant increase in setup and maintenance costs. A reef tank will cost around $45 per gallon, whereas a freshwater tank will cost between $10 and $30 per gallon. If you buy an old tank or build your own stand, you can go for less (or even have one made for you by a carpenter or friend). Fish-only systems will be the most affordable, while planted tanks and reef tanks will be the most expensive.

Equipment Purchase

When aquariums exceed 100 gallons, higher-end filtration systems are normally required to keep the tank running, regardless of whether the aim is a fish-only tank, a planted tank, or a reef tank. This is due to the quantity of bioload that these tanks will be able to handle.

A canister filter is a good option for a freshwater tank. These filters will have a huge media capacity and will stabilise your tank better than other systems. You also won’t be using giant hang-on back filters or adding unsightly equipment to the aquarium, which are more obvious at this scale.

You should consider an aquarium sump for a saltwater tank. The beautiful thing about these aquariums is that they are simple to drill, even if you obtain a regular rimmed tank. You can buy an overflow if you desire to drill the tank. A hang-on overflow can also be installed, though a drilled overflow is often more reliable.

Aquarium lights will play a role as well. If you acquire a pendant type system or discover a lighting system that has a 72′′ choice – which is normally difficult to find – you will likely need three light fixtures as a 6 foot format. If you need a 72-inch tank, Current USA is a wonderful alternative for both freshwater and saltwater tanks.


A 125 gallon aquarium will be one of the most maintenance-intensive aquariums available. Water changes are more frequent, the amount of glass to clean is more, and pruning is more frequent if you have a planted tank. If you wish to keep LPS and SPS corals in your saltwater tank, you’ll need to invest in dosing pumps, which may be required to keep them healthy.

A 125 gallon tank can also increase your maintenance expenditures. If you keep a saltwater tank, you’ll need additional salt and RODI water to keep it running. In the long term, a freshwater tank will be less expensive and take less time to maintain. When determining how much maintenance you can handle, keep this in mind.

A 125 gallon aquarium provides ample room for a variety of freshwater, brackish, and marine species.

They require the same level of maintenance as other tanks of similar capacity, albeit some activities may take longer. Due to the size of these aquariums, and as with other fish tanks, each gallon has an additional charge. Larger fish tanks are generally more expensive.

The Different Types Of 125 Gallon Aquariums

Rimless vs Rimmed Tanks

At this size, the choice between rimless and rimmed tanks becomes crucial. A 125 gallon tank takes up a lot of space. Rimmed tanks not only feature a plastic rim that detracts from the aquarium’s looks, but the thickness of the glass matters much more at this size.

Standard glass, which has a greenish hue, is used in traditional rimmed tanks. As a display tank, a rimless tank is commonly built with low iron glass, which is more clear and looks cleaner. As a result, rimless tanks will be more expensive than typical braced tanks.

It is entirely up to you to decide whether you want to pay the more for the clarity and appearance. At this magnitude, I believe the extra cost is justified. When you get to 4 and 6 foot long tanks, the hue becomes evident.

Glass vs Acrylic

Glass vs. acrylic will be another factor to consider. Both have advantages and disadvantages:

Scratching glass is really difficult.

Acrylic is a significantly lighter material.

Any tank type will have the best clarity in an acrylic tank.

Rimless glass is available in a variety of sizes. Tanks made of acrylic have bracing. Acrylic is more difficult to break than glass. Drilling acrylic is less difficult than drilling glass.

You’ll notice that I didn’t include an acrylic tank on this list. The reason for this is that the ones available on the internet are quite standard tanks. When it comes to acrylic, you’ll usually have to order one from a local fish store or have one custom manufactured if you want one that’s reef-ready or of good quality. If you desire acrylic, you need go to a dealer.

Format: 4 ft. or 6 ft.

A 125 gallon can be bought in either a 4 foot or a 6 foot length. Although the 4 foot format is normally 120 gallons, I believe it is near enough to include in the discussion. Both sides have advantages, which I shall mention below:

The 4 foot format will have a height and breadth of 24 x 24, which is great for aquascaping. A 4 foot tank is often less expensive to set up because it requires less lighting equipment and substrate. In comparison to a 6 foot long tank, there are more alternatives for reef ready and ready to operate aquariums in a 4 foot configuration. The 6 foot format is longer, giving you more possibilities for fish and allowing more territorial fish to stretch out. A larger sump, such as a 48-inch sump, can be used in a 6-foot-long tank. In a 6 foot long tank, you’ll have greater storage space.

If you’re looking for a 125 gallon tank primarily for fish, the 6 foot model is recommended. Consider the 120 gallon 4 foot size if you want to build a reef tank or a beautiful freshwater aquascape.

The Best 125 Gallon Tank Alternatives (Why Do You Need A 125 Gallon Fish Tank)

The best 125 gallon aquarium arrangements. It’s a size that’s not for everyone, but for those that are, what types of tank settings work best for this size?

Aquariums by Aquascape

A 125 gallon Aquascape Aquarium is a fantastic show tank. Many aquascapes will peak out at roughly 4 feet in length, therefore it is rarely seen in the 6 foot style. For those looking at this length, though, you may create a lovely scape and your fish possibilities expand dramatically. Angelfish and other types of fish.

Some things to keep in mind

A normal 125 gallon aquarium holds 473.2 litres. 72′′ L x 18′′ W x 21′′ H are the usual dimensions (182.9 L x 45.7 W x 53.3 H cm). Given the shape and design of each tank, these may differ.

The number of fish you can fit in a 125 gallon aquarium is entirely dependent on whether the system is freshwater or saltwater, predatory or communal, as well as the system’s overall aquascape, flow, and biotope.

Freshwater aquariums typically allow for more fish and demand that fish be housed in larger schools than saltwater aquariums. Saltwater fish require a lot of area to form territories, and most species like to swim in open water.

Predatory fish should be kept in small groups to allow them to grow to their full potential and avoid aggressiveness concerns.

The weight of 125 gallons of water alone is 1042.5 lbs (472.9 kg). A 125 gallon aquarium that is empty weighs around 200 pounds (90.7 kg). Consider the weight of the substrate, rocks, filtration, stand, lighting, and other aquarium equipment; the total weight might easily reach, if not exceed, 2000 pounds (907.2 kg)!

Every house is different, with support beams going in different directions; in general, it’s ideal to place a fish tank over as many floorboards as possible to uniformly distribute weight.

Even though a 125 gallon aquarium is long enough to span several floorboards, it may not be sufficient. Fish tanks should always be kept on the ground level for the best possibility of remaining worry-free. It would be even better if the tank could be put on a concrete-reinforced area.

Although taking on such a huge aquarium system can be intimidating, a 125 gallon aquarium can be transformed into a stunning Indonesian reef or a slice of the Amazon basin. When purchasing an aquarium, keep in mind the pricing, customer rating, quality, and included accessories; just because something is advertised as good quality and has a high price tag does not guarantee it is the ideal option for you.

A 125 gallon aquarium will satisfy many of your aquarium demands, whether you’re upgrading from a 100 gallon fish tank or downsizing from a 150 gallon fish tank.

With 125 gallons of water, you’ll have plenty of room to keep a variety of fish. It also means you’ll be able to keep larger, more territorial species that wouldn’t fit in a smaller tank. Bettas, Tetras, and Tangs are some of the most attractive fish for a tank of this size.

Many individuals are unaware that maintaining the water chemistry of larger aquariums is easier. The water properties become more steady as there is more water.

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