Best Cube Aquariums for Planted Tanks (2026)
Updated How we research
Ultum Nature Systems Dual AIO - Freshwater/Saltwater Compatible All in One Rimless Tank with Triple Chamber Filtration System, Integrated Filter Aquarium w/Leveling Mat - 17 Gallon, 40A, Black
The 17 gallon 40A is a larger model in Ultum Nature Systems' Dual AIO line: a rimless low iron tank with a built-in triple-chamber filter, pump and leveling mat, at a premium price.
Ultum Nature Systems Prism Rimless Cube Aquarium 25TM Low Iron
UNS Prism 25TM rimless cube in low iron glass, a slightly smaller Prism cube for detailed planted and shrimp layouts.
Cube aquariums trade the long, shallow footprint of a standard tank for near-equal width, depth, and height. That extra front-to-back depth gives you room to build layered hardscape with real sense of distance, which is why cubes are a favorite for iwagumi and dramatic single-focal-point scapes. When shopping, check the glass thickness relative to height, look for clean seams, and decide whether you want a rimless or braced version. A cube suits aquascapers who want a compact centerpiece that reads well from the front and the sides, rather than a wide panorama. The deeper layout can make planting and trimming the back corners a bit harder to reach, so consider how you will access the substrate. If you like composing with depth and want a tank that works as a room centerpiece, a cube is a rewarding shape to scape.
The short version
We compared 7 picks. Our scores range from 6.8 to 8.4 out of 10.
- Best overall:Ultum Nature Systems Dual AIO - Freshwater/Saltwater Compatible All in One Rimless Tank with Triple Chamber Filtration System, Integrated Filter Aquarium w/Leveling Mat - 17 Gallon, 40A, Black. Highest overall score in this guide at 8.4/10.
- Also great value:Ultum Nature Systems Prism Rimless Cube Aquarium 25TM Low Iron. Value score of 8/10, overall 8.3/10.
- Solid build:UNS Ultra Clear Rimless Cube Tank 2.1 Gallon 20C Low Iron. Build and materials score of 9/10, overall 8.3/10.
- Feature-rich:Ultum Nature Systems Prism Rimless Glass Cube Aquarium 30TM. Features score of 7/10, overall 8.1/10.
Scores are our editorial assessment, not customer ratings. How we score
- 1.Ultum Nature Systems Dual AIO - Freshwater/Saltwater Compatible All in One Rimless Tank with Triple Chamber Filtration System, Integrated Filter Aquarium w/Leveling Mat - 17 Gallon, 40A, Black8.4/10See on AmazonCheck price
- 2.Ultum Nature Systems Prism Rimless Cube Aquarium 25TM Low Iron8.3/10See on AmazonCheck price
- 3.UNS Ultra Clear Rimless Cube Tank 2.1 Gallon 20C Low Iron8.3/10See on AmazonCheck price
- 4.Ultum Nature Systems Prism Rimless Glass Cube Aquarium 30TM8.1/10See on AmazonCheck price
- 5.LANDEN 20C 2 Gallon Cube Rimless Low Iron Clear Aquarium Tank7.8/10See on AmazonCheck price
- 6.HIRO Aquatics Cube Rimless Frameless Extra Clear Low Iron Glass Aquarium7.3/10See on AmazonCheck price
- 7.2 Gallon Nano Cube Low Iron Ultra Clear Glass Aquarium6.8/10See on AmazonCheck price
#1The 17 gallon 40A is a larger model in Ultum Nature Systems' Dual AIO line: a rimless low iron tank with a built-in triple-chamber filter, pump and leveling mat, at a premium price.
Fit for the job 9/10 · Features and specs 9/10 · Build and materials 9/10 · Value 6/10
- + Integrated triple-chamber filter with coarse sponge, bio-media and a water pump, so no external filter is needed
- + 91% clarity low iron glass with 45-degree mitered edges and unobtrusive silicone
- + Listed for both freshwater and saltwater use, and a leveling mat comes with the tank
- - A premium-priced tank, and the rear filter chamber takes space out of the display area
- - Feature bullets give the 40A model name but no exact dimensions, so confirm the footprint before buying a stand
#2UNS Prism 25TM rimless cube in low iron glass, a slightly smaller Prism cube for detailed planted and shrimp layouts.
Fit for the job 9/10 · Features and specs 7/10 · Build and materials 9/10 · Value 8/10
- + Low iron glass makes the Prism 25TM a clear showcase for stone and moss work
- + Smaller cube is easier to light and maintain than larger display cubes
- + Ultum build quality suits keepers wanting a long-term centerpiece tank
- - Tall cube shapes make trimming the back corners fiddly without long tools
- - Check the dimensions against your space to confirm the volume
#3UNS 20C, a 2.1 gallon ultra clear rimless cube in low iron glass, a trusted nano cube for moss and shrimp scapes.
Fit for the job 9/10 · Features and specs 7/10 · Build and materials 9/10 · Value 8/10
- + Ultum's low iron glass gives high clarity even at this very small size
- + The 2.1 gallon cube suits Riccia, moss and tiny rock layouts for shrimp
- + Clean silicone lines keep the small tank looking neat in close-up photos
- - Tiny size offers almost no margin for error with feeding and fertilizers
- - Needs a very compact heater and filter that do not dominate the view
#4Ultum Nature Systems Prism 30TM rimless glass cube, a premium cube for scapers who want a gallery-style display.
Fit for the job 9/10 · Features and specs 7/10 · Build and materials 9/10 · Value 7/10
- + Prism line from UNS is designed for display quality aquascapes and photography
- + Larger 30TM cube gives room for dramatic tall hardscape and rich planting
- + Rimless glass lets emersed plants and wood grow up out of the tank
- - Confirm whether the glass is low iron if clarity matters to you
- - Premium cube pricing is higher than standard glass tanks of similar volume
#5The LANDEN 20C, a 2 gallon rimless low iron cube tank for tiny shrimp scapes and moss displays on a desk.
Fit for the job 8/10 · Features and specs 7/10 · Build and materials 8/10 · Value 8/10
- + Compact 2 gallon cube fits in the smallest spaces while still looking premium
- + Low iron glass and rimless edges show off tiny plant detail clearly
- + Cube shape gives height for mini tree layouts using small branchy wood
- - Tiny cube needs careful feeding, as waste builds up quickly in so little water
- - Few nano lights are sized for a small cube, so fitting options are limited
#6HIRO Aquatics cube in frameless extra clear low iron glass, a clean cube shell for nature style and shrimp aquascapes.
Fit for the job 8/10 · Features and specs 6/10 · Build and materials 8/10 · Value 7/10
- + Cube proportions give depth for layered hardscape that shallow tanks cannot match
- + Extra clear low iron glass shows plants and stone texture from all sides
- + Frameless build suits emersed growth and modern clip-on lighting
- - Title gives no volume, so compare the cube sizes before picking a variant
- - Cubes are harder to light evenly, so choose a light that fully covers the top
#7A generic 2 gallon nano cube in low iron ultra clear glass, a budget pick for a shrimp or moss cube on a desk.
Fit for the job 7/10 · Features and specs 6/10 · Build and materials 6/10 · Value 8/10
- + Low iron glass at a low price makes a clear cube accessible to new keepers
- + The 2 gallon cube suits a simple moss, stone and shrimp micro-scape
- + Small size is easy to clean, rescape and move around
- - Budget glass, so seam finish can vary between individual tanks
- - Tiny cube leaves little room for equipment like heaters and filters
Before you buy: trade-offs we flagged
No pick is perfect. These are the main compromises we noted for the top products in this guide, so you can check they will not matter for you.
- A premium-priced tank, and the rear filter chamber takes space out of the display area (Ultum Nature Systems Dual AIO -...)
- Tall cube shapes make trimming the back corners fiddly without long tools (Ultum Nature Systems Prism Rimless Cube...)
- Tiny size offers almost no margin for error with feeding and fertilizers (UNS Ultra Clear Rimless Cube Tank 2.1 Gallon...)
- Confirm whether the glass is low iron if clarity matters to you (Ultum Nature Systems Prism Rimless Glass Cube...)
- Tiny cube needs careful feeding, as waste builds up quickly in so little water (LANDEN 20C 2 Gallon Cube Rimless Low Iron...)
- Title gives no volume, so compare the cube sizes before picking a variant (HIRO Aquatics Cube Rimless Frameless Extra...)
Frequently asked questions
›What is the best choice among cube aquariums for planted tanks (2026)?
Ultum Nature Systems Dual AIO - Freshwater/Saltwater Compatible All in One Rimless Tank with Triple Chamber Filtration System, Integrated Filter Aquarium w/Leveling Mat - 17 Gallon, 40A, Black is our top overall pick. The 17 gallon 40A is a larger model in Ultum Nature Systems' Dual AIO line: a rimless low iron tank with a built-in triple-chamber filter, pump and leveling mat, at a premium price. It earns our score of 8.4/10, based on fit for the job, features, build and value.
›What is a good budget option?
Ultum Nature Systems Prism Rimless Cube Aquarium 25TM Low Iron is the strongest low-cost pick in this guide. UNS Prism 25TM rimless cube in low iron glass, a slightly smaller Prism cube for detailed planted and shrimp layouts.
›How much should I expect to spend?
Picks in this guide span See on Amazon price bands (roughly: $ = under $30, $$ = $30 to $100, $$$ = over $100). We never display exact prices because they change constantly, so the buttons above always show Amazon's current price.
›How were these products chosen?
We shortlist products that fit the job this guide solves and compare their published specifications, such as size, capacity, materials and what is included. Each pick gets an editorial score out of 10 for fit, features, build and value, and we write the pros and cons from those details. Our score is not an Amazon customer rating. We earn a commission if you buy through our links, which never affects the ranking.
Aquascape Nest independently selects every product; we may earn a commission from links above.
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