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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 357 reviews
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Availability: In Stock.
Fulfilled by SubstrateSource

Arrives Aug 26 – Aug 28
Order within 17 hours and 52 minutes
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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


Shape: Rectangular


Specific Uses For Product: Indoor


Style: Modern


Color: Nano


Included Components: Black Dense Foam Leveling Mat


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: #32,507 in Pet Supplies (See Top 100 in Pet Supplies) #35 in Aquariums


#35 in Aquariums:


Customer Reviews: 4.8 4.8 out of 5 stars (357)


Brand Name: Ultum Nature Systems


Included Components: Black Dense Foam Leveling Mat


Model Number: 3N


UPC: 863741000315


Number of Items: 1


Global Trade Identification Number: 15


Manufacturer: Ultum Nature Systems


Unit Count: 1 Count


Manufacturer Part Number: 3N


Additional Features: Easy to Clean, Rimless


Specific Uses For Product: Indoor


Pet Type: Fish


Tank Volume: 3 gallons


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


Item Shape: Rectangular


Product Style: Modern


Color: Nano


Material Type: Glass


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Aug 26 – Aug 28

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.

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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

  • Beautiful tank!
Pattern Name: Nano Size: [3N] - 3 Gal - 12.2 x 7.48 x 7.48 in
I got the 3 gallon nano tank for my shrimp. This is a beautiful tank and the quality is excellent. It showed up well packaged and on time. I’ve wanted this tank for a long time and it did not disappoint. UNS is worth the extra money. I got the UNS glass lid with clips and it’s perfect 😍
Reviewed in the United States on February 14, 2026 by Jessica Flynn

  • absolutely beautiful tank
it took a little while to get here I would say maybe a week and a half two weeks I can’t remember exactly the tank is absolutely beautiful. We really wanted this brand this is the one artificial intelligence told us to get. But they did not make it in the size that we needed we only had one area that we could put it. So we tried because we accidentally thought we were ordering the correct size and the wrong size came so in any event this is still beautiful but we had to return it I would highly recommend these tanks but it’s hard to find them ... show more
Reviewed in the United States on July 11, 2026 by Taking Action!

  • Amazing Quality!
Pattern Name: Long Size: [90L] - 21.3 Gal - 35.43 x 11.81 x 11.81 in
Amazing Aquarium. High quality, and so clear! They packaged the tank very well! I love it so much
Reviewed in the United States on August 4, 2026 by GlamTrashMakeup

  • Excellent – perfect for my betta fish
Pattern Name: Nano Size: [3N] - 3 Gal - 12.2 x 7.48 x 7.48 in
Excellent product. It works perfectly and is ideal for my betta fish. The size and design are just right, and it performs exactly as described. Very easy to use and great quality overall. I’m very satisfied with this purchase and would definitely recommend it for betta fish.
Reviewed in the United States on January 19, 2026 by Frank

  • 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

  • Quality glass
This is my favorite tank from UNS, easy to clean and large enough for hard scapes and fish
Reviewed in the United States on April 5, 2026 by David B.

  • Beautiful Rimless Nano Tank!
Beautiful rimless nano tank. Can’t wait to set it up! It came package well and arrived with no flaws. Next nano tank I’m buying from them again.
Reviewed in the United States on July 26, 2026 by MilitaryDad

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