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10 Best Fish Tanks 2025 in the UK

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Our Top Picks

#2

Diversa AQUARIUM WITH LID AND STAND/CABINET Professional Fish Tank - Real Glass, Standard Rectangle (160 Litre Set)

Rating
9.8
Size
Lighting
Size
The aquarium's size is just right, offering plenty of room for aquatic pets, making it ideal for species like axolotls.
Lighting
The quality of the tank and lighting is impressive, with the LED light providing excellent brightness.

The Diversa Aquarium with Lid and Stand is a well-rounded option for those serious about setting up a reliable and stylish fish tank. With a generous 160-litre capacity, this aquarium is crafted from Float Guardian Glass, which ensures both durability and excellent clarity for viewing your aquatic life. The glass thickness of 6 mm adds an extra layer of safety, making it sturdy and secure, which is crucial for protecting your aquatic pets.

The inclusion of a 20W LED light is a strong point, providing 2550 lumens of brightness at 6500K, ideal for promoting vibrant plant life and creating a natural ambiance. Its energy efficiency, rated at A+, means it won’t inflate your electricity bill, which is a nice touch for continuous, worry-free operation. The aquarium comes with a well-designed stand, complementing its minimalist style and ensuring stability. This is a great addition for those wanting to seamlessly integrate the tank into their home decor. Additionally, the free aquarium mat is a thoughtful inclusion, helping to protect surfaces and further stabilize the tank.

However, it's worth noting that the aquarium does not come with a filtration or heating system. These are crucial components for maintaining a healthy environment for fish, so you will need to invest in these separately. This could be an additional expense and requires some research to ensure compatibility with the tank's size. Weighing in at 50 kg, it’s relatively heavy, which might pose challenges during setup or relocation. But once in place, its weight contributes to its stability. Despite the lack of filtration and heating, it's best suited for those prepared to finalize their setup with additional equipment.

Rating
9.8
Size
Lighting
Size
The aquarium's size is just right, offering plenty of room for aquatic pets, making it ideal for species like axolotls.
Lighting
The quality of the tank and lighting is impressive, with the LED light providing excellent brightness.
#3

Diversa AQUARIUM WITH LID AND STAND/CABINET Professional Fish Tank - Real Glass, Standard Rectangle (112 Litre Set)

Rating
9.7
Size
Material
Lighting
Size
The tank offers an ideal size that's not too big or small, providing ample swimming space especially appreciated for species like axolotls.
Material
The glass quality is sturdy and clear, contributing to a premium feel and excellent viewing experience.
Lighting
The included LED lighting is exceptionally bright and energy-efficient, enhancing the look of the aquarium and supporting plant growth.

The Diversa Aquarium with Lid and Stand is a solid choice if you’re looking for a medium-sized glass fish tank with a good balance of quality and convenience. Its 112-litre capacity and rectangular shape suit a variety of freshwater setups, offering enough room for small to medium fish communities. Made from sturdy 6 mm float glass, the tank promises durability and clear viewing, which is great for enjoying your aquatic pets. The included LED lighting is bright (1800 lumens) and energy-efficient, helping plants thrive and fish look their best without driving up your electricity bill.

The stand adds stability and style, making it easier to place the tank safely in your room. The free aquarium mat is a nice bonus to protect surfaces. The tank’s height (105 cm) is quite tall, so it’s important to consider the space you have available.

With a 2-year warranty and positive customer ratings, this set is a dependable option, especially for those who want a strong, visually appealing aquarium base, but be prepared to add some essential equipment like filters and heaters to keep your fish happy.

Rating
9.7
Size
Material
Lighting
Size
The tank offers an ideal size that's not too big or small, providing ample swimming space especially appreciated for species like axolotls.
Material
The glass quality is sturdy and clear, contributing to a premium feel and excellent viewing experience.
Lighting
The included LED lighting is exceptionally bright and energy-efficient, enhancing the look of the aquarium and supporting plant growth.

Buying Guide for the Best Fish Tanks

Choosing the right fish tank is essential for the health and happiness of your aquatic pets. There are several factors to consider, including the size, material, filtration system, and lighting. Understanding these key specifications will help you make an informed decision that suits your needs and ensures a thriving environment for your fish.
SizeThe size of the fish tank is crucial because it determines how many fish you can keep and how comfortable they will be. Fish tanks come in various sizes, from small desktop aquariums to large tanks that can hold hundreds of gallons. Smaller tanks (under 20 gallons) are suitable for beginners or those with limited space, but they require more frequent maintenance. Medium tanks (20-50 gallons) offer a balance between ease of maintenance and space for fish. Large tanks (over 50 gallons) provide ample room for a diverse range of fish and plants but require more space and investment. Consider the number and type of fish you want to keep, as well as the space available in your home, when choosing the size.
MaterialFish tanks are typically made from glass or acrylic. Glass tanks are more scratch-resistant and provide clearer viewing, but they are heavier and can be more fragile. Acrylic tanks are lighter and more durable, making them easier to move and less likely to break, but they can scratch more easily. If you plan to move the tank frequently or have children who might bump into it, an acrylic tank might be a better choice. For a permanent setup with a clear view, glass is often preferred.
Filtration SystemA good filtration system is essential for maintaining water quality and keeping your fish healthy. There are three main types of filtration: mechanical, biological, and chemical. Mechanical filters remove debris, biological filters break down waste using beneficial bacteria, and chemical filters remove toxins. For small tanks, a simple hang-on-back filter might suffice. For larger tanks, a canister filter or sump system provides more thorough filtration. Consider the type and number of fish you have, as some species produce more waste and require more robust filtration.
LightingProper lighting is important for the health of your fish and any live plants in the tank. Fish tanks can be equipped with fluorescent, LED, or incandescent lights. LED lights are energy-efficient and provide a range of colors and intensities, making them a popular choice. Fluorescent lights are good for plant growth but can be less visually appealing. Incandescent lights are less common due to their heat output and energy consumption. If you have live plants, choose lighting that supports plant growth. For fish-only tanks, focus on lighting that enhances the appearance of your fish.
HeatingMaintaining the right temperature is vital for the health of your fish. Most tropical fish require a stable temperature between 75-80°F, while cold-water fish like goldfish prefer cooler temperatures. Heaters come in various types, including submersible and in-line heaters. Submersible heaters are placed inside the tank and are easy to install, while in-line heaters are connected to the filtration system and provide more consistent heating. Choose a heater based on the type of fish you have and the size of your tank.
Decorations and SubstrateDecorations and substrate (the material at the bottom of the tank) are not just for aesthetics; they also provide hiding places and breeding grounds for fish. Substrate can be gravel, sand, or specialized plant soil. Gravel is easy to clean and comes in various colors, while sand is more natural but can be harder to clean. Plant soil is ideal for tanks with live plants. Decorations like rocks, driftwood, and artificial plants create a stimulating environment for fish. Choose decorations and substrate based on the needs of your fish and the look you want to achieve.