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Aquariums · Top 10

Top 10 All-in-One Reef Tanks in 2027

By Kory White · Updated Oct 2026 · 5 min read
Waterbox AIO 20 Cube
Direct answer

The Waterbox AIO 20 Cube is the best all-in-one reef tank, with 20 gal, 6 mm glass and a built-in filter for $289.99. The Fluval Evo 13.5, with its light and pump included, is #2 and the Innovative Marine NUVO Fusion Pro 2 20 is #3.

At a glance

#PickTotal water volumeBest for
1Waterbox AIO 20 Cube20 galA 20-gallon reef with built-in filtration at a fair price
2Fluval Evo 13.513.5 US galA first saltwater tank with the light and pump included
3Innovative Marine NUVO Fusion Pro 2 20Approximately 20 galHobbyists who want to add skimmers, reactors and other drop-in gadgets
4Red Sea MAX NANO G2 Cube19.8 galA plug-and-play reef with an app-controlled reef light and skimmer included
5Coralife LED BioCube 3232 galBeginners who want more water volume in a complete kit
6Waterbox AIO 10 Cube10.9 galA small desktop reef with a built-in rear filter
7Innovative Marine NUVO Fusion Pro 2 10Approximately 10 galA desktop nano with the same gadget ecosystem as the bigger Fusions
8Fluval Evo 55 US galThe smallest complete saltwater kit on this list
9Red Sea MAX NANO G2 XXL53 galA large mixed reef from one complete system
10JBJ Nano-Cube WiFi 2828 galA curved-front 28-gallon with app-controlled lighting

Pick by what you want

Best overall
Waterbox AIO 20 Cube
Best starter kit
Fluval Evo 13.5
Best for add-on gadgets
Innovative Marine NUVO Fusion Pro 2 20
Best plug-and-play premium
Red Sea MAX NANO G2 Cube
Biggest system
Red Sea MAX NANO G2 XXL

The ranking

1

Waterbox AIO 20 Cube

Waterbox AIO 20 Cube
Answrs VerdictThe best all-round all-in-one reef tank.
Total water volume: 20 galPrice: $289.99 (system only, no cabinet)Dimensions: 17.7 x 17.7 x 15.7 inGlass thickness: 6 mmIncluded: Filter socks, carbon pellets, ceramic rings, adjustable nozzle returns and return pump

The Waterbox AIO 20 Cube holds 20 gal in a 17.7 x 17.7 x 15.7 in footprint with 6 mm glass. Filter socks, carbon pellets, ceramic rings, adjustable returns and the return pump come with it, for $289.99 (system only, no cabinet).

Go ifA 20-gallon reef with built-in filtration at a fair price
Skip ifYou want a light included in the box
Why #1 over #2: Its 20 gal gives more water than the Evo 13.5’s 13.5 US gal for steadier conditions.
2

Fluval Evo 13.5

Fluval Evo 13.5
Answrs VerdictThe best complete starter kit.
Total water volume: 13.5 US galPrice: Not published (sold through retailers)Pump output: 132 US GPHLED: 14000 K, 31 LEDs, 1383 lm, reef-capableDimensions: 22 x 15 x 11.5 in

The Fluval Evo 13.5 is a 13.5 US gal saltwater kit with a reef-capable 14000 K LED (31 LEDs, 1383 lm), a 132 US GPH pump and 3-stage filtration hidden behind a honeycomb wrap. Fluval sells it through retailers and does not publish a price.

Go ifA first saltwater tank with the light and pump included
Skip ifYou plan to keep demanding stony corals
Why #2 over #3: It includes a reef-capable light, while the Fusion Pro 2 20 does not.
3

Innovative Marine NUVO Fusion Pro 2 20

Innovative Marine NUVO Fusion Pro 2 20
Answrs VerdictThe tinkerer’s 20-gallon.
Total water volume: Approximately 20 galPrice: $558 list with APS pedestalReturn pump: MightyJet 15W/24V 326 GPH DC with controllerGlass: 6 mm low-ironSafety: Built-in emergency overflow and mesh screen lid

The Innovative Marine NUVO Fusion Pro 2 20 holds approximately 20 gal behind 6 mm low-iron glass, with a MightyJet 326 GPH DC return pump, an emergency overflow and a mesh lid. It lists at $558 with an APS pedestal.

Go ifHobbyists who want to add skimmers, reactors and other drop-in gadgets
Skip ifYou want a light included
Why #3 over #4: Its $558 list price with a pedestal is well below the MAX NANO G2 Cube’s $1149 with a cabinet.
4

Red Sea MAX NANO G2 Cube

Red Sea MAX NANO G2 Cube
Answrs VerdictThe most complete premium nano.
Total water volume: 19.8 galPrice: $799 without cabinet, $1149 with cabinet (US retail)Light: 1 ReefLED G2 60Main system pump: 250 gphProtein skimmer: Included (water flow 46 gph)

The Red Sea MAX NANO G2 Cube holds 19.8 gal and comes with a ReefLED G2 60 light, a 250 gph main pump and a protein skimmer. Red Sea lists it at $799 without a cabinet and $1149 with one.

Go ifA plug-and-play reef with an app-controlled reef light and skimmer included
Skip ifYou are on a tight budget
Why #4 over #5: It includes a reef light and a skimmer, which the BioCube 32 does not.
5

Coralife LED BioCube 32

Coralife LED BioCube 32
Answrs VerdictThe roomy classic starter.
Total water volume: 32 galPrice: Not published (sold through retailers)Dimensions: 22 x 24 x 23.88 inLighting: LED hood with 24-hour timer and three channels: white, blue and color-enhancingFiltration: Built-in rear chamber, submersible pump, dual intakes, adjustable return nozzle

The Coralife LED BioCube 32 holds 32 gal and measures 22 x 24 x 23.88 in. Its LED hood has a 24-hour timer and white, blue and color-enhancing channels, and the rear chamber holds the filter and a submersible pump.

Go ifBeginners who want more water volume in a complete kit
Skip ifYou want rimless low-iron glass
Why #5 over #6: Its 32 gal is far more water than the AIO 10 Cube’s 10.9 gal.
6

Waterbox AIO 10 Cube

Waterbox AIO 10 Cube
Answrs VerdictThe clean desktop cube.
Total water volume: 10.9 galPrice: $199.99 (system only)Dimensions: 13.8 x 14.2 x 13.8 inGlass thickness: 5 mm

The Waterbox AIO 10 Cube holds 10.9 gal on a 13.8 x 14.2 x 13.8 in footprint with 5 mm glass and built-in filtration. It costs $199.99 for the system only.

Go ifA small desktop reef with a built-in rear filter
Skip ifYou need room for a full-size skimmer
Why #6 over #7: At $199.99 it costs less than the Fusion Pro 2 10’s $321 list price.
7

Innovative Marine NUVO Fusion Pro 2 10

Innovative Marine NUVO Fusion Pro 2 10
Answrs VerdictThe upgradeable desktop nano.
Total water volume: Approximately 10 galPrice: $321 listReturn pump: MightyJet 15W/24V 326 GPH DC with controllerOutside dimensions: 11.8 x 15 x 13 inGlass: 6 mm low-iron

The Innovative Marine NUVO Fusion Pro 2 10 holds approximately 10 gal, measures 11.8 x 15 x 13 in outside and uses the same MightyJet 326 GPH DC return pump as its bigger sibling. It lists at $321.

Go ifA desktop nano with the same gadget ecosystem as the bigger Fusions
Skip ifYou want a light included
Why #7 over #8: Its approximately 10 gal holds more than the Evo 5’s 5 US gal.
8

Fluval Evo 5

Fluval Evo 5
Answrs VerdictThe pico starter.
Total water volume: 5 US galPrice: Not published (sold through retailers)Pump output: 55-80 US GPHLED: 11000 K, 37 LEDs, 759 lm, reef-capableDimensions: 20.5 x 11.5 x 7.5 in

The Fluval Evo 5 is a 5 US gal saltwater kit with a reef-capable 11000 K LED (37 LEDs), a 55-80 US GPH pump and 3-stage filtration, in a 20.5 x 11.5 x 7.5 in tank.

Go ifThe smallest complete saltwater kit on this list
Skip ifYou want stable water with little attention
Why #8 over #9: At 20.5 x 11.5 x 7.5 in it fits on a desk, unlike the 53 gal MAX NANO G2 XXL.
9

Red Sea MAX NANO G2 XXL

Red Sea MAX NANO G2 XXL
Answrs VerdictThe big-system pick.
Total water volume: 53 galPrice: $2049 without cabinet, $2449 with cabinet (US retail)Display tank volume: 44.5 galLight: 2 ReefLED G2 60 unitsMain system pump: 2 x 410 gph

The Red Sea MAX NANO G2 XXL holds 53 gal total (44.5 gal in the display) with 2 ReefLED G2 60 lights and 2 x 410 gph main pumps. Red Sea lists it at $2049 without a cabinet and $2449 with one.

Go ifA large mixed reef from one complete system
Skip ifYou want a desktop tank
Why #9 over #10: It runs 2 ReefLED G2 60 lights, while the JBJ uses a single 40 W LED hood.
10

JBJ Nano-Cube WiFi 28

JBJ Nano-Cube WiFi 28
Answrs VerdictThe app-lit classic cube.
Total water volume: 28 galPrice: Not published (sold through retailers)LED: 40 W, three channels (white, red, blue), app controlReturn pumps: 2 x SP-1000, 266 gal/h eachGlass: 8 mm low iron

The JBJ Nano-Cube WiFi 28 holds 28 gal behind 8 mm low-iron glass, with a 40 W three-channel LED hood you control from an app and 2 SP-1000 return pumps at 266 gal/h each.

Go ifA curved-front 28-gallon with app-controlled lighting
Skip ifYou want a rimless look

How we ranked these

We ranked each tank on its built-in filtration, water volume, glass and pump, then on each maker’s published price. Volumes, specs and prices come from each maker’s own product page. Facts are taken from each maker's own published information; check the official site before you buy.

Questions people ask

What is the best all-in-one reef tank?

The Waterbox AIO 20 Cube: 20 gal with 6 mm glass and a built-in filter with return pump, for $289.99 (system only, no cabinet).

What is the best all-in-one reef tank for a beginner?

The Fluval Evo 13.5 comes with a reef-capable 14000 K LED, a 132 US GPH pump and 3-stage filtration in 13.5 US gal.

Which all-in-one reef tank holds the most water?

The Red Sea MAX NANO G2 XXL at 53 gal total, with 2 ReefLED G2 60 lights; it lists at $2049 without a cabinet.

How much does the Red Sea MAX NANO G2 Cube cost?

Red Sea lists a US retail price of $799 without a cabinet and $1149 with one.

Total water volume (as published) at a glance

Fluval Evo 55 gal
Innovative Marine NUVO Fusion Pro 2 1010 gal
Waterbox AIO 10 Cube10.9 gal
Fluval Evo 13.513.5 gal
Red Sea MAX NANO G2 Cube19.8 gal
Waterbox AIO 20 Cube20 gal
Innovative Marine NUVO Fusion Pro 2 2020 gal
JBJ Nano-Cube WiFi 2828 gal
Coralife LED BioCube 3232 gal
Red Sea MAX NANO G2 XXL53 gal
Total water volume (as published), as published by each maker. Picks without a published figure are left off.

Official sites

Sources

Prices, specs and availability change; confirm on the official site before you buy.