Search  for anything...

Ultum Nature Systems Ultra Clear Rimless Aquarium - Low Iron Glass Fish Tank with 45° Mitered Edges, 5mm-12mm Thick, Leveling Mat Included (3N, Nano, 3 Gallon)

  • Based on 287 reviews
Condition: New
Checking for the best price...
$64.98 Why this price?
New Year Deal · 14% off was $75.98

Buy Now, Pay Later


As low as $10.83 / mo
  • – 6-month term
  • – No impact on credit
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Apple Pay, and PayTomorrow. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

FREE 30-day refund/replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.


Availability: In Stock.
Fulfilled by SubstrateSource

Arrives Tuesday, Feb 3
Order within 14 hours and 18 minutes
Available payment plans shown during checkout

Protection Plan Protect Your Purchase
Checking for protection plans...

Pattern Name: Nano


Size: [3N] - 3 Gal - 12.2 x 7.48 x 7.48 in


Features

  • Crafted with low iron 91% clarity glass and 45-degree corners The glass appears clearer with a minimal greenish or blue tint with uninterrupted edges, providing a more true-to-life representation of your aquatic environment.
  • Constructed with German made silicone Bonded together using high quality adhesive rated for moisture and durability, our tanks give peace-of-mind for even the most dedicated aquarium enthusiasts.
  • Leveling mat included Leveling mats add a non-slip surface to the base of your tank and are a necessity for adding support and stability for keeping your tank safe and secure from shifting or slipping.
  • 3N - 12.2" x 7.48" x 7.48"

Description

These rimless aquariums are carefully crafted using 91% clarity diamante glass, a highly transparent extra clear glass with very little residual green color. The low iron content in the glass provides uninterrupted crystal clear visibility. The 45° mitered edges are bonded together using high performance German silicone specifically designed for aquarium construction. Rather than following the conventional sizing of other rimless aquarium brands, our dimensions keep the aqua caper in mind by focusing on the golden ratio. The additional space makes it easier to achieve that sense of perspective and truly show depth in an aqua cape. Each ultra clear tank comes with a black leveling mat which is crucial so you don't have to cut up your wife's yoga mat.

Brand: Ultum Nature Systems


Material: Glass


Tank Volume: 3 Gallons


Special Feature: Easy to Clean, Rimless


Product Dimensions: 12.2"L x 7.48"W x 7.48"H


Specific Uses For Product: Indoor


Style: Modern


Color: Nano


Included Components: Black Dense Foam Leveling Mat


UPC:


Is Discontinued By Manufacturer ‏ : ‎ No


Product Dimensions ‏ : ‎ 12.2 x 7.48 x 7.48 inches; 5 Pounds


Item model number ‏ : ‎ 3N


Date First Available ‏ : ‎ September 29, 2016


Manufacturer ‏ : ‎ Ultum Nature Systems


Best Sellers Rank: #31,418 in Pet Supplies (See Top 100 in Pet Supplies) #41 in Aquariums


#41 in Aquariums:


Customer Reviews: 4.7 4.7 out of 5 stars (314)


Item Weight: 4.99 pounds


Manufacturer: Ultum Nature Systems


Item model number: 3N


Date First Available: September 29, 2016


Item Package Dimensions L x W x H: 14.5 x 11 x 11 inches


Item Dimensions LxWxH: 12.2 x 7.48 x 7.48 inches


Brand Name: Ultum Nature Systems


Target Audience Keyword: aquarists, corals, fish


Country of Origin: China


Color: Nano


Size: [3N] 3 Gal 12.2 x 7.48 x 7.48


Material: Glass


Number of Items: 1


Style: Modern


Included Components: Black Dense Foam Leveling Mat


Specific Uses for Product: Indoor


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Tuesday, Feb 3

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Top Amazon Reviews


  • looks great
Pattern Name: Long Size: [60L] - 6.3 Gal - 23.62 x 7.87 x 7.87 in
i think a large part about aquarium review is longevity, which i cant review yet. but for the tank itself, it is very nice. the glass is clear. the whole thing looks very clean. its a nice tank and worth the premium imo.
Reviewed in the United States on December 7, 2025 by j

  • Amazing tank
Pattern Name: Long Size: [60L] - 6.3 Gal - 23.62 x 7.87 x 7.87 in
Amazing tank! Perfect size, so clear it seems like the fish are floating and such a great design. I love this tank!
Reviewed in the United States on December 16, 2025 by Miguel A. Nieves-Maldonado

  • Quality rimless!
Pattern Name: Long Size: [90L] - 21.3 Gal - 35.43 x 11.81 x 11.81 in
90 Long (21.3 gals) Beautiful rimless tank! Quality and worth the money. Arrived early and packaged well.
Reviewed in the United States on November 23, 2025 by P T

  • Makes for a beautiful terrarium water area.
I got this 2.5g as a water area for my zoo med 25g reptihabitat, and made a DIY waterfall going into it, and it's just perfect. It has a very, very sturdy construction - I messed up my first attempt at the expansion foam waterfall, and the foam expanded too much and pushed this aquarium into the front panel of the terrarium, breaking the panel, and the aquarium didn't even have a scratch. ... show more
Reviewed in the United States on January 6, 2026 by Ashton Ashton

  • Best in the industry
Pattern Name: Long Size: [90L] - 21.3 Gal - 35.43 x 11.81 x 11.81 in
They’re the best !
Reviewed in the United States on December 30, 2025 by andres Linares andres Linares

  • Exactly what I was looking for!!
Beautiful and crystal clear
Reviewed in the United States on December 29, 2025 by John Barton John Barton

  • Absolutely beautiful tank!
Pattern Name: Long Size: [90L] - 21.3 Gal - 35.43 x 11.81 x 11.81 in
The UNS Ultra Clear Rimless Tank – 21.3GAL is absolutely fantastic! It was everything I hoped it would be and more. The glass is thick, crystal clear, and heavy-duty. The seams are perfectly smooth, just what you want for a high-quality tank. Delivery was faster than expected, and it arrived well-protected in 3 boxes with Styrofoam padding, so there was no damage at all. Setup was easy, and the clarity of the glass really makes any display look amazing. Highly recommend for anyone looking for a sturdy, premium, rimless aquarium! ... show more
Reviewed in the United States on November 24, 2025 by Christian Helton Christian Helton

  • Gorgeous small aquarium
Pattern Name: Cube Size: [25C] - 4 Gal - 9.84 x 9.84 x 9.84 in
This concerns the 4.1 gallon size aquarium, which arrived today. It's stated as a 10 inch cube, but that's approximate. It's actually metric, 25 centimeters along each edge. That 25 cm is correct, according to my tape measure. In inches, it's 9.84, if anybody cares about the difference, which I don't. The glass thickness is 5 millimeters, by my actual measurement. It was very well packed. When it arrived, one edge of the carton was dented, which worried me. No problem, though. Inside the carton, the aquarium was protected by a top cap, a bottom cap, and stiff edge protectors, all surrounded by a thick layer of styrofoam peanuts. So despite the dented carton, the aquarium was fine. Styrofoam peanuts are a nuisance because of static electricity, and they shed tiny particles, but they do a great job of protection, and that's what counts. The aquarium looks perfect. I examined it very carefully, all the sides, the bottom, all the edges, both visually, and by running my fingertips along the edges. No roughness or unevenness, no problems at all, that I could find. Flawless. When I was chasing tiny particles of styrofoam with a moist paper towel, I noticed the glass was squeaky clean. That's exactly what the whole aquarium looks like, a pristine cube of squeaky clean glass. It passed the initial exam with flying colors. I'll check it for leaks by adding a little distilled water now and then over the next couple days. Based on how well made it looks, I don't expect any problem, but if it leaks I'll edit this and let people know. I think my Betta is going to be a happy camper pretty soon. ... show more
Reviewed in the United States on February 20, 2019 by Jeff Jordan

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...