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Aquarium & Fish Keeping · Accessories & Add-ons

Fish Tanks & Aquariums: What Else You'll Need

By the Nest & Yard editorial teamUpdated 2026-08-094 min read

Our pick: the Fluval SPEC Aquarium Kit, Aquarium with LED Lighting and 3-Stage Filtration System, 5-Gallon — the best Fish Tanks & Aquariums we tested, from £104.99.

Setting up an aquarium can be a hugely rewarding experience, but it’s easy to focus solely on the tank itself and overlook some crucial supporting elements. Beyond the fish tank and filtration system, you'll need accessories like mounts to secure your display safely, replacement parts for pumps or lights, and protective cases to safeguard your investment. This guide explores the common add-ons and consumables that many aquarists don’t initially budget for, covering everything from cabling and lighting upgrades to essential maintenance supplies.

See the full range in Fish Tanks & Aquariums.

Fluval SPEC Aquarium Kit, Aquarium with LED Lighting and 3-Stage Filtration System, 5-Gallon
Editor's Choice

#1 Pick

Fluval SPEC Aquarium Kit, Aquarium with LED Lighting and 3-Stage Filtration System, 5-Gallon
Rated 4.5 out of 5 stars (1,203)
  • 19 Litre

£104.99

Pros

  • Compact 5-gallon (19-litre) footprint suits desks and small living spaces
  • Integrated 3-stage filtration and LED lighting come built in, ready to run
  • Sleek anodized aluminium trim gives a more premium look than typical starter kits

Cons

  • Small capacity limits stocking to nano fish, shrimp or a betta
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Pros

  • Shatter-resistant acrylic construction is 10x stronger than glass and retains heat better
  • 360-degree curved view suits a centrepiece spot in any room
  • Complete beginner kit includes LED lighting, air pump, filter cartridge and ceramic media

Cons

  • Acrylic scratches more easily than glass if cleaned with an abrasive pad
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Pros

  • Integrated LED lighting and easy-care 4-stage filter come built in, so there is nothing extra to buy
  • Compact 28-litre footprint suits desks, shelves and small rooms
  • Interpet is a long-established UK aquatics brand with wide parts availability

Cons

  • Small capacity limits stocking to a handful of small fish or a betta
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Pros

  • All-in-one starter kit bundles LED lighting, filter, heater and water conditioner
  • Panoramic scratch-resistant glass gives a clear view from anywhere in the room
  • Built-in Aquacare reminder system helps new keepers stay on top of maintenance

Cons

  • Larger 64-litre footprint needs a dedicated stand or cabinet
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FAQ

I've just bought a new fish tank – what should I be looking for in the box?

A standard aquarium delivery will typically include the glass or acrylic tank itself, a substrate (gravel or sand), an adjustable filter, a heater, and some basic decor like rocks or driftwood. However, you’ll often need to source additional items such as lighting and water testing kits separately.

What kind of lighting do I need for my fish?

Most basic aquarium heaters don't include lighting, so you'll require a dedicated aquarium light designed for plant or fish growth. LEDs are becoming increasingly popular due to their energy efficiency and long lifespan – research the specific needs of your chosen fish.

I need something to keep the water clean - what’s included with a filter?

Filters come with media packs, but these often require replacement regularly; consider buying additional filter cartridges or sponges based on your tank size and stocking levels. Regularly cleaning and replacing this media is essential for maintaining water quality.

My fish need to be able to swim around – do I need a lid?

While not always included, a lid is highly recommended for preventing fish from jumping out of the tank, protecting delicate plants, and reducing evaporation. Look for lids with adjustable clips or locking mechanisms for added security.

What about water testing? How do I know if my water’s healthy?

You'll need a test kit to monitor parameters like pH, ammonia, nitrite, and nitrate levels – these are crucial for fish health. Liquid test kits generally offer more accurate results than strips.

I’ve got some decorations - do I need anything else for my fish to hide in?

Providing adequate hiding places is important for reducing stress on your fish; consider incorporating caves, dense plants (real or artificial), and driftwood into the tank’s layout. Ensure any additions are aquarium-safe.

What about water conditioners? Why do I need them?

Water conditioners neutralise harmful chemicals like chlorine and chloramine found in tap water, which are lethal to fish. Always treat new water before adding it to the tank.

How often should I be changing the water?

Regular partial water changes (typically 25-50%) are vital for maintaining a healthy aquarium – this removes nitrates and replenishes essential minerals. Plan your water change schedule based on your fish population and filter capacity.

What about food? What type do I need?

Choose a food appropriate for the species of fish you've selected, considering their dietary needs and size; flake food is common but many fish benefit from varied feeding schedules.

Are there any tools I should buy to help with maintaining my tank?

Consider purchasing an algae scraper for cleaning the glass, a gravel vacuum for substrate cleaning, and perhaps some aquarium-safe scissors or tweezers for planting live plants – these will significantly simplify maintenance tasks.

In depth

Setting up an aquarium is far more involved than simply purchasing the tank itself. A significant portion of the initial cost often centres around essential equipment – filters, heaters, lighting – but equally important are the ongoing consumables and supplementary items that ensure the long-term health and vibrancy of your aquatic inhabitants. Many new aquarists underestimate the breadth of what’s truly required, leading to unexpected expenses and potentially detrimental effects on their fish.

Firstly, consider filtration. While a basic filter may come with the aquarium initially, it rarely provides sufficient biological or mechanical filtration for a thriving ecosystem. You'll need to invest in either a canister filter (a larger unit that handles substantial debris), a hang-on-back filter (more compact but often less powerful), or, increasingly popular, a sponge filter – these are fantastic for delicate species and juvenile fish, offering gentle flow and ample surface area for beneficial bacteria colonization. Don’t forget replacement filter cartridges or sponges; these need to be regularly replaced depending on the size of your tank and the bioload generated by your fish. Furthermore, investing in activated carbon is almost essential. It removes impurities, toxins, and medications that might otherwise build up over time, improving water clarity and contributing to a healthier environment for your fish.

Heating is another critical element, particularly if you’re housing tropical species. The starter heater included with many tanks tends to be inadequate or unreliable. A more robust submersible heater with a thermostat is strongly recommended; these allow precise temperature control – crucial for preventing stress and disease in sensitive fish. Alongside the heater itself, consider probes and thermometers to monitor water temperatures accurately. These aren’t expensive but are vital for maintaining stable conditions. Regular testing of your heater's performance with a multimeter is also advisable – ensuring it’s functioning correctly prevents sudden temperature fluctuations that can be fatal to your aquatic pets.

Lighting plays an important role not just in viewing your aquarium, but also influencing the growth of live plants if you intend to keep them. Starter LED lights are common, however, they often lack the spectral output required for optimal plant growth. Investing in a dedicated aquarium light – typically full-spectrum LEDs – will provide the necessary wavelengths for photosynthesis and promote healthy plant development. Consider the intensity needed depending on your planted setup; more demanding plants require brighter lighting. Alongside the light itself, you’ll need timers to regulate the photoperiod (the amount of time the lights are on), mimicking natural daylight cycles.

Substrates – the material that forms the bottom of your tank – are frequently overlooked. Gravel or sand may be included initially, but they often lack the necessary properties for a healthy aquarium environment. Investing in an appropriate substrate is vital; for planted tanks, nutrient-rich substrates designed to support root growth are essential. For fish-only setups, you’ll need to consider the pH levels of your chosen substrate and ensure it's compatible with your fish species. Regular vacuuming or siphoning of the substrate is crucial to remove waste buildup – a gravel vacuum is an indispensable tool for this purpose.

Water parameters are arguably the most critical aspect of aquarium care, and maintaining them requires a suite of test kits. Starter kits usually provide basic pH, ammonia, nitrite, and nitrate tests, but more comprehensive testing will reveal nuances in your water chemistry that are vital for fish health. Regularly monitoring these parameters allows you to proactively address any imbalances before they affect your fish. Beyond the initial test kit, consider investing in liquid test reagents – these are generally considered more accurate than strip tests. You’ll also need dechlorinator to remove chlorine and chloramine from tap water, as these are toxic to most aquatic life. Maintaining consistent levels of essential trace elements (such as iron, magnesium, and iodine) is equally crucial for plant growth and fish health; these are typically added through a dedicated trace element supplement.

Finally, don’t underestimate the importance of accessories such as algae scrapers, airline tubing with connectors, and various containers for water changes. Algae scrapers help keep glass clean and prevent excessive algal blooms. Airline tubing is essential for circulation – particularly in smaller tanks – and connectors allow you to adapt hoses to your specific needs. Regular partial water changes are fundamental to maintaining a healthy aquarium; having appropriately sized buckets and containers is crucial for this process. Remember, a well-equipped aquarium isn’t just about the tank itself; it's an investment in the long-term wellbeing of its inhabitants.

The Nest & Yard editorial team

Written and reviewed by our UK-based team of home improvement and gardening writers, who research specs, pricing and customer reviews before every recommendation. Reviewed and updated on 2026-08-09.

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