Which is the Best Fish Tank to Buy?

An image of a goldfish inside a small clear fish bowl

Pet fish can make a great addition to any home, as they bring a sense of calm and tranquillity to the household and provide a relatively low-maintenance option for busy owners. Although they are usually easy to care for, they require a suitable fish tank to flourish in so that their health, well-being and daily lives are the best they can be. 

While most pets can thrive in various homes, fish are accustomed to specific conditions and cannot survive in the wrong environment. This means that more considerations need to be made when choosing a home for your fish. 

Choosing a fish tank can be challenging, especially with so many options available in today’s market. Whether purchasing a shoal of tropical fish or a single goldfish, you’ll want to provide your new pet with the best home possible. 

Our guide is designed to help you decide on the right fish tank to buy for your fish so they can stay healthy and happy throughout their lifespan. Read on to learn more about how to find the right size fish tank for your pet, other aquarium supplies you might need and whether to keep different types of fish together or separately. With our expert advice, you can create the perfect environment for your fish to live in. 


  1. What size fish tank should I buy?
  2. What aquarium supplies do I need?
  3. Do I need separate tropical fish tanks and goldfish tanks?
  4. Fish tanks at Discount Leisure Products 

What size fish tank should I buy? 

The size of your fish tank should be determined by the number of fish you’re looking to buy and the size and species of each one. 

It’s important to consider the size of your tank before you purchase your fish, as having too many fish in one tank can cause various problems that can easily be avoided. A large number of fish living in a confined space can result in a lower amount of oxygenated water, causing multiple health issues in your fish. This environment can also lead to excessive fish excrement in the water, causing elevated ammonia levels, raising the water’s pH to deadly levels.

A crowded tank can also be extremely stressful for fish. This environment is often unnatural to them, particularly when they are used to swimming in natural bodies or water with a large amount of space. 

To ensure you’re creating the right environment for your fish, you should establish the ideal water capacity per fish according to their type. This will vary depending on their species. However, you can simplify this process by using their length to determine how much water they need. 

Cold-water fish that measure one inch in length require around four and a half litres of water each. Using this rule, you can tailor your tank to suit the number and size of your fish. Tropical species have a slightly smaller ratio, as a fish measuring an inch in length requires around two and a half litres of water. The exact quantities of water needed for your fish can also vary based on their width and shape, so this method should only be considered as a guide. Once you’ve established what size tank you need, you can find a suitable one to hold your fish.

An image of a goldfish inside an aquarium filled with plants

What aquarium supplies do I need?

A fish tank should be a self-contained ecosystem filled with life. Once you’ve selected a tank for your aquarium, you may need to purchase additional items to help create a better environment for your fish. 

The most important piece of equipment for an aquarium is a water filter. Proper filtration is needed for your aquarium to sustain life. Choosing an effective design will allow you to maintain your tank and eliminate the need for manual cleaning every few days. Filters remove harmful materials from the water and trap particles such as plant leaves, excrement and uneaten food so they can be removed from the tank before decomposing into ammonia. 

If you keep various species of fish, such as tropical fish, you must install an aquarium heater to ensure the water is kept at a stable temperature. The type of heater you choose should be based on the size of your fish tank, and many heater manufacturers suggest specific sizes for each heater they offer. 

A thermometer is also needed to monitor the water temperature, with most digital models providing convenient daily monitoring to simplify your aquarium maintenance. An element of lighting is also necessary for those who keep plants in their aquarium, as this is crucial for the photosynthesis process that allows plants to grow and remain healthy. 

Do I need separate tropical fish tanks and goldfish tanks?

Although you may wish to keep all of your fish in the same aquarium, you’ll need to consider their species and preferred environments. For example, coldwater fish cannot be kept in the same aquarium as tropical fish, as they require different water temperatures to promote strong growth. While goldfish can benefit from a heater to maintain a constant temperature in the aquarium, this would need to remain between 20°C and 23°C, which is too cold for tropical species. 

Moreover, goldfish require a larger-sized tank than tropical fish such as Neon Tetras, as they are more active swimmers and need more space to move around. They are also friendly creatures and prefer to be surrounded by other goldfish, so putting them in a tank with another species will likely cause them stress. 

However, you can keep various freshwater tropical fish in the same tank if they are similar. They should prefer the same temperature, water pH and food and be able to swim in different areas of the aquarium to make for a peaceful fish community.

Fish tanks at Discount Leisure Products

Discount Leisure Products proudly offers an excellent range of aquarium fish tanks to suit the ecosystem you want to create. Some of our most popular brands include Reef One and SuperFish, so plenty of options are available for various requirements. 

If you have an idea of what size fish tank you need but are unsure which type you should choose, browse our recommendations to find an option that suits your fish’s needs. See our recommendations for large and small fish tanks below and explore our various brands: 

Large fish tanks

We offer several large tanks for beginners, but the Leddy 40 Aquarium Set with Night and Day LED Lighting is an excellent choice for beginners. This fish tank holds up to 40 litres of water and features a changeable lighting system that replicates sun and moonlight so that you can view and monitor your fish throughout the day and night. It provides ideal living conditions for different aquatic life and is incredibly spacious. The brand also offers 60 and 75-litre options that can accommodate more fish. 

Small fish tanks 

You can also find more compact, contemporary fish tanks in our collection, ideal for smaller fish and invertebrates. The Reef One BiOrb Life Aquarium 15 Litre Fish Tank can fit in various areas of your home, making it extremely versatile. It also features a built-in bottom filter with biological media and a replaceable service cartridge that should be replaced every four weeks. This tank is suitable for various creatures; however, it’s important to research the aquatic life you plan to keep before choosing your tank.

Popular features of fish tanks include LED lighting, internal filtration, heaters and top covers, so it’s easy to find an option tailored to your requirements. Whether you’re looking to keep multiple tropical fish species or solitary aquatic life, our collection is guaranteed to have an option for you.

Now that you know the best fish tank to buy for your fish, you can create the perfect environment to maintain their health and well-being and encourage proper growth. Whether you need a high-quality tank, a reliable filter and thermometer or aquarium ornaments and decoration to build a home they want to explore, our extensive aquarium supplies have everything you need to prepare for your new pet. Browse our collection today, or discover our other product ranges, including pond, pool and spa supplies.


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