Cube Rimless Glass Aquariums

Symmetrical, versatile cube tanks for aquascaping
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The Ultimate Rimless Glass Aquarium Tank

Ultum Nature Systems was the first brand to produce rimless aquariums using ultra high clarity low iron glass with a very unique feature - the 45 degree mitered edge. Unlike traditional rimless aquariums, where all 5 panels of glass are cut with a flat edge then bonded together with clear silicone, the Ultum Nature Systems aquariums take it to the next level.

The mitered edge used by UNS on 4 glass panels allows for a much more seamless joint and requires less silicone to form the corners of an aquarium. This means that not only are the corner edges much cooler to look at, the silicone can be much more precise and cleaned up nicer, which means no globs of leftover dried silicone. A secondary benefit to this is that because the silicone is now angled unlike their flat edged 90 degree counterparts, aquarium maintenance tools such as an algae scraper can clean up against each corner without the worry of accidentally cutting into and degrading the silicone seam overtime, which could lead to potential tank leakage.
Glass Aqua Rimless Glass Aquarium Tank
Ultum Nature Systems UNS Rimless Glass Aquarium Tank

Industry standard 90 degree versus Ultum Nature Systems 45 degree edge
Ultum nature systems UNS Rimless Glass Aquarium Tank
Ultum nature systems UNS Rimless Glass Aquarium Tank

The minimal usage of silicone provides a cleaner look while the holding strength is just as strong as traditional silicone seamed corners.
Ultum Nature Systems UNS Rimless Glass Aquarium Tank
Ultum nature systems UNS 60S Shallow Rimless Glass Aquarium Tank

When viewed at different angles, the corners of Ultum Nature Systems Rimless Aquarium are less distracting.

Rimless Glass Cube Aquariums for Aquascaping

Explore our collection and choose from popular cube sizes ranging from 1 to 30 gallons—or make a statement with an impressive 57-gallon tank!
Why Choose a Cube Aquarium?
Ultum Nature Systems (UNS) cube aquariums are a top choice for freshwater aquariums. These tanks feature low-iron, ultra-clear glass and offer clear visibility for aquascaping, freshwater fish and rare plants.
A Cube Tank for Every Hobbyist
Whether you're just beginning research, new to the hobby or working on a contest aquarium, there's a great cube for you:

Starter Kits: Our ready-to-go cube tank kits are convenient and include essential equipment for a plug-and-play setup.
Nano Cube Aquarium: Add Biophilic design elements to your desktop, countertop or any small space. Perfect for shrimp tanks or a beginner-friendly Betta Fish tank.
Large Cube Aquarium: Use these for traditional aquascaping, Iwagumi layouts, Wabi Kusa setups or to display rare plant specimen.
AIO Cube Aquarium: Start a planted tank without having to figure out additional gear like filters!