Ultum Nature Systems Rimless Cube Glass Aquarium Tank

UNS Rimless Cube Glass Aquarium Tank - Glass Aqua

$29.99 USD

Size

Usually ships in 1-2 business days from our fulfillment center

IMPORTANT: If your order arrives damaged, please take photos and contact us right away—we’re here to help. For full details on returns, exchanges, and other important information, please visit our FAQ.

Ultum Nature Systems cube rimless aquariums are well-suited for desktops, nightstands, and console tables, offering a compact footprint without sacrificing visual appeal. With equal dimensions on all sides, cube tanks naturally draw attention toward the center of the layout, creating a strong focal point within the aquascape.

This format is popular for shrimp tanks, Betta fish, and themed aquascapes. Their symmetry also makes it easy to create a gallery-style display of multiple cubes, allowing hobbyists to explore different aquascaping styles and techniques side by side. Clean and sleek in appearance, cube aquariums highlight the colors and textures of a planted tank in a more focused, immersive way.

Like all UNS aquariums, each tank is crafted with ultra-clear low iron glass and clean, minimalist lines, offering a refined foundation for your next freshwater planted or saltwater reef aquarium.

Shown in the video below is an Ultum Nature Systems 20C rimless tank:

Tank Features
Original 45° mitered edges for a seamless, high-end finish
Low iron glass with 91% clarity diamant glass
High-quality German silicone for long-term durability
Symmetrical proportions for center-focused aquascape layouts
Available in multiple sizes from 1 to 57 gallons

Includes: Black Leveling Mat

Tank Size Guide


Model	Dimensions (IN) W x D x H	Glass Thickness (MM)	Volume (GAL)
16C	6.29 x 6.29 x 6.29	5	1
20C	7.87 x 7.87 x 7.87	5	2.1
25C	9.84 x 9.84 x 9.84	5	4.1
30C	11.81 x 11.81 x 11.81	5	7.1
40C	15.74 x 15.74 x 15.74	6	16.9
45C	17.71 x 17.71 x 17.71	6	24
50C	19.68 x 19.68 x 19.68	8	33
60C	23.62 x 23.62 x 23.62	10	57

Ultum Nature Systems creates premium aquarium products designed by hobbyists, for hobbyists. Known for thoughtful design that first appeared in their line of rimless aquariums, they continue to move ground in the industry, with the health of your aquarium always at the forefront. Since the release, the brand has expanded into a variety of aquarium needs and everyday essentials that fuse form and function.

From best-selling substrates like Controsoil and Controsand to powerful filtration systems and nutrient-packed aquatic plant fertilizers for aquascapes at every stage, you're sure to find something you didn't know you needed. Jump further in and browse CO2 gear, various natural hardscape choices, then pick up some live aquatic plants and the tools you need to plant, maintain, and keep your tank looking its best. With a recent venture into the world of marine, UNS supports today's aquarium hobbyists every step of the way.

Inspired by nature and powered by the art of aquascaping, plan your next aquarium project with Ultum Nature Systems today.

Shop all UNS

Overall rating: 4.9547324 / 5 from 243 reviews.

AI Generated Review Summary

The UNS Rimless Cube Glass Aquarium Tank is praised for its high-quality glass, perfect size, and excellent customer service. Customers appreciate the crystal-clear glass, seamless edges, and fast shipping. Ideal for various fish species, it offers a beautiful and functional addition to any space.

Summary topics

Product Quality: 19%
Customer Service: 6%
Glass Clarity: 17%
Tank Size: 5%

Review topics: ["size","color","support","issues","light","quality","customer service","feels","shipping","design","looks","work","packaging","glass","edges","service","dimensions","construction","shape","price","corners","speed","tank","aquarium","clarity","lines","seams","lid","plants","experience"].

Review highlights

"Great quality tanks at a great value, low-iron glass, perfect silicone seams, mitered edges." — Jonathan S.
"Excellent purchase, love the clear low iron glass, and the 45 degree smooth finish edges." — Zak K.
"Excellent quality, crystal clear glass, beautiful perfect seams and the size is perfect for a betta." — TUONG N.

Reviews

Great product

"I purchased the UNS 40C for a bioactive terrarium to house my pet millipede, and I couldn't be happier with it. The tank is exceptionally well built, with sturdy construction and a beautifully minimalist design. The glass is crystal clear, and its thickness gives the aquarium a premium, high-quality feel while providing confidence in its durability. It truly elevates the entire display and makes the terrarium look like a showcase piece. Highly recommended if you're looking for a rimless tank with outstanding craftsmanship."

— Yeongji J. (5/5)

Beautiful

"I absolutely love the 17 inch cube and the lite. It’s gorgeous"

— LEIGH S. (5/5)

Beautiful aquarium

"I got this to make my first aquascape: its sturdy, beautiful, and sleep. The mitered edge looks gorgeous and the clarity is superb."

— Nicholas B. (5/5)

Beautiful Tanks

"Love the sleek look of these tanks. Purchased 2 and they were perfect for my layout. Would definitely recimmend."

— Kevin D. (5/5)

UNS 45 U

"This tank is wonderful. It looks great and it comes with a mat. My only issue with the tank is that there was a small scratch but nothing major and barely even noticeable."

— Quinn M. (5/5)

Comfortable prices and shipping! Great selection of plants! List goes on…

"Hi! My name is Pablo I live in NY I recently got into the fish keeping hobby I mostly do bettas. I got my third betta may 18 of this year 2026. I came across glass aqua after trying to find a couple of plants for my 3 gallon UNS long tank that I also purchased from Glass aqua. I was originally looking at Bruce plants but no hate to them most of their collection is out of stock and I find more of a variety on glass aqua other than Bruce plants. I mean, I’m talking about soils, an extremely great selection of plants especially for beginners like me. My shipment is also fast which I extremely love since I am an impatient guy. For something to be shipped to California and arrive to your door across the United States in NY in less than a week. That’s extremely impressive! I am most likely to recommend glass aqua to others and I’m definitely coming back."

— Pablo M. (5/5)

UNS tanks are the best

"UNS tanks are the best, glass is great, sizes are always great, never had a leak (I have 3 of them, all different sizes), & glass aqua has the fastest shipping for the UNS brand tanks which are already fairly hard to find."

— Kelsie F. (5/5)

"It came very fast love the tank looks very nice"

— Anthony (5/5)

Love the Tank!

"Great quality and delivered safely! Can’t ask for much more."

— Niki C. (5/5)

Great Tank

"very slick"

— Chris S. (5/5)

Q&A

Is this glass tempered?? Wondering if I can drill this tank?: Hello Jordan, thank you for your question. UNS tanks are non-tempered, therefore they are drillable on all panels if wanted. We highly suggest seeing a professional, as drilling into a UNS tank voids the warranty. If there is anything else we can assist you with, please feel free to contact us at hello@glassaqua.com. Kindly, Glass Aqua
Would you be able to add the weight associated with each model?: Very light lol

Shipping
Orders are typically processed within 1-2 business days M-F. However, additional time may be required during peak seasons and federal holidays. For orders containing live plants, we exercise extra caution and assess factors such as travel distance and weather to ensure safe transit.

To avoid delays, please ensure all order information is accurate and complete. We cannot offer refunds and are not responsible for orders shipped to incorrect addresses due to errors in provided information. Once an order has been shipped, delivery times are determined by the carrier and are outside of our control. On average, shipments arrive within 2–5 business days, excluding weekends and holidays. For more information, please visit our FAQ page.

Returns
If you are not satisfied with your purchase, please contact us within 48 hours of delivery. Approved returns must be shipped back within 14 days of approval. Returned items must be unused, unopened, and in their original packaging. Specific return requirements, if applicable, will be listed on the product’s page. For more information, please visit our FAQ page.

Refunds
No worries, we’ll take care of everything as long as it fits the guidelines above.Most answers to general questions can be found on our FAQ page.