Product Overview
The Ultum Nature Systems (UNS) 40C 16.9 Gallon Ultra Clear Rimless Aquarium offers a perfectly balanced, mid-sized symmetrical canvas. Featuring equal dimensions on all sides, the Cube format naturally focuses the viewer's attention inward, making it an ideal footprint for central island rock/wood scapes, dwarf shrimp colonies, or planted nano fish communities.
Key Features & Benefits
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91% Diamant Ultra-Clear Glass: Premium low-iron glass eliminates the green tint found in standard aquariums for true-to-life color accuracy.
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45° Mitered Edges & German Silicone: Precision-cut 45-degree mitered joints double the bonding surface area for high-performance German clear silicone, forming stronger seams.
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Symmetrical Cube Geometry: Perfectly proportioned length, width, and height create a clean visual frame with generous front-to-back depth (15.75"), offering versatile 360-degree aquascaping potential.
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Signature Laser-Etched Branding: Features a clean, laser-etched UNS logo in the glass corner for an authentic finish that will not peel or fade.
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Acoustic Leveling Mat Included: Includes a pre-cut dense foam leveling mat to absorb micro-vibrations, level minor surface imperfections, and prevent structural stress cracks under heavy load.
Model Dimensions & Specifications
| Feature |
Specification |
| Model |
UNS 40C Cube Rimless |
| Dimensions (L x W x H) |
15.75" x 15.75" x 15.75" (40 x 40 x 40 cm) |
| Total Volume |
16.9 Gallons (64.0 Liters) |
| Glass Thickness |
6 mm |
| Glass Type |
91% Clarity Diamant Low-Iron Glass |
| Seam Construction |
45° Precision Mitered Joints with Clear German Silicone |
| Branding |
Signature Laser-Etched Corner Logo |
What's Included
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1x UNS 40C Ultra Clear Rimless Glass Aquarium
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1x Custom-Fit Black Foam Leveling Mat
Hassle-Free Guaranteed Tank Delivery
We always guarantee safe delivery of our tanks. In the unlikely event that your tank arrives damaged or broken by the carrier, we will immediately ship out a replacement at no additional cost to you. Please send photos of the damaged tank in its original shipping box so that we can file a claim with UPS on your behalf. Please allow an additional 2-3 business days in case of potential logistical delays.
Frequently Asked Questions
1. Why select a 16.9-gallon cube aquarium over a standard rectangular tank?
A cube aquarium like the UNS 40C offers equal dimensions on all sides, providing a symmetrical viewing frame that centers your focal point. The 15.75" depth gives you significantly more front-to-back room than standard nano tanks, enabling deep substrate slopes and multi-layered plant arrangements.
2. What livestock is best suited for a 16.9-gallon cube tank?
The 16.9-gallon volume of the UNS 40C provides ample biological stability for dwarf shrimp colonies (Neocaridina/Caridina), nerite snails, a showpiece Betta, or small schooling nano fish such as Ember Tetras, Celestial Pearl Danios, and Chili Rasboras.
3. Why is a leveling mat mandatory for rimless aquariums?
Because rimless glass tanks rest directly on their bottom panel without a raised plastic frame, even a microscopic grain of sand on a stand can create concentrated stress points under weight. The included dense foam mat absorbs micro-imperfections and distributes weight evenly across the entire footprint to prevent glass stress cracks.
