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QUICK VERDICT
Our picks at a glance
The Fluval Evo 52L is the cheapest complete kit, the Aqua One MiniReef 90 gives you a proper sump in a compact cabinet, and the Red Sea MAX NANO G2 Cube is the most complete premium package.
Best budget kit
Fluval Sea Evo 52L
£149.99–£169.99
The cheapest complete starting point
Search Amazon UK ↗Best compact sump system
Aqua One MiniReef 90
£419.99 SSP
The smallest way into a proper sump setup
Search Amazon UK ↗Best premium package
Red Sea MAX NANO G2 Cube
£729–£749 listed
The most complete package in the box
Search Amazon UK ↗OUR PICKS IN DETAIL
Who each one is really for
Best budget kit
Fluval Sea Evo 52L
Best for
The cheapest complete starting point
Why we picked it
Included: Light, 500lph pump, cover and filtration media.
The catch
Still required: Heater, extra flow if you need it, water preparation and testing.
Yes, if a small footprint and low starting cost matter more to you than extra stability and room for equipment.
Search Amazon UK ↗Best compact sump system
Aqua One MiniReef 90
Best for
The smallest way into a proper sump setup
Why we picked it
Included: Cabinet, StripGlo light, sump and pipework.
The catch
Still required: Heater; check exactly which return pump and skimmer are in the bundle before you buy.
Yes, if you want a sump in a small cabinet and don’t mind choosing a few more parts yourself.
Search Amazon UK ↗Best premium package
Red Sea MAX NANO G2 Cube
Best for
The most complete package in the box
Why we picked it
Included: ReefLED, 950lph return, protein skimmer and rear filtration.
The catch
Still required: Heater, water preparation, testing and the usual start-up supplies.
Yes, if equipment that’s designed to work together is worth more to you than the lowest starting price.
Search Amazon UK ↗HOW WE RESEARCHED
How we chose
We compared manuals, manufacturer specifications, current UK retailer listings, running requirements, ownership costs and support. This is desk research, not hands-on testing, and where something is uncertain we say so.
- Real water volume and dimensions
- What’s included and what’s missing
- Cost of the finished setup
- UK stock and warranty
- Room to upgrade and maintain
The short answer
The Fluval Evo 52L is the cheapest complete kit here. The Aqua One MiniReef 90 is the compact choice if you want a real sump in the cabinet. The Red Sea MAX NANO G2 Cube is the most complete premium package. The Waterbox AIO 20 stays on our watchlist until UK stock and the warranty route are confirmed.
| Tank | Size / checked price | What’s in the box, and what isn’t | Our take |
|---|---|---|---|
| Fluval Sea Evo 52L Budget all-in-one | 52L; 56 × 38.5 × 29cm £149.99–£169.99 | Included: Light, 500lph pump, cover and filtration media You’ll still need: Heater, extra flow if you need it, water preparation and testing | The cheapest complete starting point |
| Aqua One MiniReef 90 Compact tank with cabinet sump | 85L; 45 × 45 × 45cm display £419.99 SSP | Included: Cabinet, StripGlo light, sump and pipework You’ll still need: Heater; check exactly which return pump and skimmer are in the bundle before you buy | The smallest way into a proper sump setup |
| Red Sea MAX NANO G2 Cube Premium complete all-in-one | 75L system / 62L display; 45cm cube £729–£749 listed | Included: ReefLED, 950lph return, protein skimmer and rear filtration You’ll still need: Heater, water preparation, testing and the usual start-up supplies | The most complete package in the box |
| Waterbox AIO 20 Cube Flexible all-in-one (watchlist) | 76L; 45 × 45 × 40cm £166 tank / £390 with cabinet listed | Included: Return pump, filter sock, carbon, ceramic media and mat You’ll still need: Reef light, heater and any extra filtration you want | Great spec, but check UK stock and support first |
Small doesn’t mean simple
A nano takes up less space and holds less water, which also means tighter chambers, faster evaporation, quicker temperature swings and less room to work. A kit is only convenient if your heater, sensors, media and cleaning tools fit in the actual rear chamber, not just in the marketing photo.
A warning about Waterbox in the UK
Waterbox says it stopped distributing directly in the UK and EU at the end of 2024, and now supplies the region through two European partners. UK shops still list older and newer Waterbox tanks, but stock is unreliable. Before you buy, get written confirmation of where the tank ships from, what happens if it arrives damaged, who handles the warranty and where spare parts come from. Read the full Red Sea vs Waterbox comparison.
Sources and limits
We checked specifications against Fluval, Aqua One, Red Sea and Waterbox. UK prices come from current or recent listings at Porton Aquapet, Mill Race, Straits Aquatics and Kraken Corals. We haven’t measured noise, light output or long-term reliability ourselves.
WHICH ONE FITS YOU?
Which kind of nano do you want to look after?
The lowest sensible starting cost
The Fluval Evo 52L gives you a complete basic setup for the lowest price we found. You’ll still need to budget for a heater, water preparation, testing and possibly extra flow from day one.
Your first sump
The MiniReef 90 suits anyone who wants equipment hidden in the cabinet, sump-style. Check the exact retailer bundle, because the return pump and skimmer included can vary.
A premium system that just works together
The MAX NANO G2 Cube takes several equipment decisions off your plate by bundling parts designed to work together. That’s only worth paying for if the included light, skimmer and ecosystem suit the reef you want.
HOW TO CHOOSE
What to check before you buy
Know the real water volume
Rear chambers, sumps, sand and rock all reduce the water you actually have. Don’t base stocking, dosing or stability decisions on the biggest litre figure in the product name.
Check every included part
‘Included’ doesn’t mean right for your livestock. List the light, return pump, filtration, lid, cabinet and skimmer you get, then list what’s missing: heater, extra flow, auto top-off and water preparation.
Make sure you can maintain it
Small tanks can be fiddly to service. Check the space behind the tank, whether you can lift out the skimmer cup, where the cables go, how the lid opens, and whether your hand reaches the bottom of every chamber.
Confirm support before it arrives
Cracked glass and missing parts are expensive problems. Find out how delivery damage is handled, whether spare parts are available, and whether the shop or the manufacturer deals with warranty claims.
RUNNING COSTS
What it costs after you buy it
The finished setup
The tank is just the first line on the bill. Add a heater, RODI, salt, rock, sand, test kits, flow, cleaning tools and some contingency before deciding what you can afford.
Evaporation and top-off
Small tanks lose water quickly. A lid reduces evaporation but can trap heat and reduce gas exchange; an auto top-off adds cost and needs space for a reservoir.
Future upgrades
The rear chamber limits what you can add later. Price likely upgrades now, so a cheap kit doesn’t quietly turn into a string of expensive replacements.
ALTERNATIVES
Other options worth a look
Tank-only all-in-one
A flexible Waterbox-style tank makes sense if you already know which light and equipment you want, but confirm UK stock and warranty support first.
A bigger second-hand system
Buying used can get you more water for your money, but check the glass, seals, pumps and lights carefully, and make sure no plumbing is missing.
HOW WE RANK
What it takes to make our list
It has to fit
Before we compare features, we rule out anything that doesn’t suit the tank, the installation or the job. A famous name can’t win if its size, operating range, connections or controls make it a poor match.
Claims need context
A spec sheet tells you what a product is designed to do, not how it will behave in your reef. So we look at the conditions behind every capacity, flow, output and accuracy claim, and flag any conclusion that’s an informed judgement rather than a measurement.
Every pick shows its catch
Each product’s main drawback sits right next to its biggest strength. We don’t hide a support worry, a missing accessory, a vague rating or a pricey ecosystem just because the product is the best choice for one type of buyer.
UK ownership breaks ties
Availability, what’s actually in the box, consumables, spares, UK plugs and the warranty route all count. When two products do the job equally well, the one that’s easier to own in the UK gets the stronger recommendation.
We don’t publish a one-size-fits-all league table. Each award answers a different buying situation, and the final verdict explains which trade-off we’d make. If your tank, budget or routine doesn’t match any of them, use the checks above to build your own shortlist rather than just buying the top badge.
COMMON QUESTIONS
Frequently asked questions
Is a nano reef cheaper to run?
Usually, yes: it uses less salt, light and heating. But specialist compact equipment and frequent upgrades can eat into the saving.
Is an all-in-one reef tank ready for fish and corals out of the box?
No. It may include the core hardware, but you still need to prepare water, cycle the tank, test, control the temperature and plan your livestock.
Are nano reefs good for beginners?
They can be, but less water means conditions change faster. A disciplined maintenance routine matters more than any ‘beginner’ label.
BEFORE YOU ORDER
Three checks before you pay
Confirm the exact model
Shop listings often mix up generations, sizes and regional versions. Check the full model code, UK plug, included accessories and who handles the warranty against the manufacturer’s own details. Save the product page and spec sheet in case the listing changes.
Price everything it needs
Add the mount, controller, adapters, consumables, test kit and likely replacement parts you’ll need to run it. Compare that first-year total, not the headline price, and keep a little extra for plumbing, cable tidying or the fitting you forgot.
Measure twice at home
Measure your tank, cabinet, sump chamber, glass, sockets and the space you need to service it. Then write down the one job this kit has to do, and how you’ll know it’s working. If it won’t fit, or you can’t tell whether it’s doing its job, it’s the wrong choice.
Prices and stock change quickly. Every price here is a dated UK snapshot, so confirm the total at checkout and the returns terms, and don’t swap in a similarly named model without running these checks again.
OUR VERDICT
Choose the setup you can keep running
Buy the Fluval Evo for the cheapest complete start, the MiniReef 90 for a compact sump, and the MAX NANO G2 Cube for equipment that’s designed to work together. Keep Waterbox on the watchlist until UK stock and support are confirmed.
Once your tank is running, the free Reef Companion keeps your maintenance, water tests and spending in one place, which matters more on a nano, where things change quickly.