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Allcolor

Allcolor Low Iron Glass Ultra Clear Rimless Aquarium Tank (21Gal)

  • Based on 361 reviews
Condition: New
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Availability: In Stock.
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Arrives Wednesday, Oct 14
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Size: 21Gal 23.6"L×13.7"W×14.9"H


Features

  • PREMIUM LOW-IRON GLASS - Features ultra-clear, low-iron glass and a sleek rimless design. It provides an unobstructed view and true-to-life color representation, making your aquascaping and freshwater plants look vibrant and naturally beautiful without any distracting green tint.
  • SEAMLESS JOINTS & STRUCTURAL INTEGRITY - The quality of a premium rimless aquarium depends entirely on professional assembly. Each tank is individually bonded and detailed by experienced specialists. This meticulous manual process ensures exceptionally thin, uniform, and near-invisible silicone joints that provide reliable structural integrity.
  • ADVANCED ENGINEERED BONDING - To complement the skill of our specialists, we utilize top-tier German silicone engineered for exceptional tensile strength and anti-aging durability. This professional-grade sealing ensures optimal stress distribution across all glass panels, delivering a highly secure and dependable setup for long-term home or office display.
  • MINIMALIST POLISHED FINISH - Every glass edge undergoes a rigorous multi-step polishing process to achieve ultra-smooth, scratch-resistant beveled finishes. This meticulous attention to detail prevents cuts during intricate aquascaping and routine trimming, while enhancing the minimalist, water-suspension aesthetic.
  • PRODUCT SPECIFICATIONS - Size:23.62 x 13.78 x 14.96 inches (60 x 35 x 38 cm).Thickness:6mm.Capacity: 21 Gallons. Includes: One set of matching top glass canopy with clips and a protective bottom cushioning mat. Due to the fragile nature of large glassware, we provide reinforced packaging. If you have any questions or issues upon arrival, our customer care team is always ready to assist you.

Description

We pursue perfect products. During the production process, five pieces of high-quality low-iron glass have to go through more than ten procedures before they are turned into a rimless aquarium, and then go through at least three more quality control procedures before they are finally sold as qualified products. You'll find nothing less than perfection, from the grinding and polishing of the glass edges to the fine detailing of the glue joints.

Brand: Allcolor


Material: Exhibition grade low iron glass


Tank Volume: 21 gallons


Special Feature: Rimless


Product Dimensions: 23.62"L x 13.78"W x 14.96"H


Item Weight: 22.54 kg


Shape: Rectangular


Specific Uses For Product: Indoor


Style: Rimless 90 degrees Right Angle


Color: Clear


Product Dimensions ‏ : ‎ 23.62 x 13.78 x 14.96 inches; 49.7 pounds


Item model number ‏ : ‎ Rimless


Date First Available ‏ : ‎ June 4, 2021


Manufacturer ‏ : ‎ Allcolor


Best Sellers Rank: #50,917 in Pet Supplies (See Top 100 in Pet Supplies) #72 in Aquariums


#72 in Aquariums:


Customer Reviews: 4.2 4.2 out of 5 stars (361)


Brand Name: Allcolor


Included Components: Lid


Model Number: Rimless


Number of Items: 1


Number of Packs: 1


Manufacturer: Allcolor


Item Highlight: Artisan Grade Fish Tank for Professional Aquascaping and Planted Layouts, 6-60 Gallons (21Gal - Top Glass Canopy)


Unit Count: 1 Count


Manufacturer Part Number: Rimless


Material Type: Exhibition grade low iron glass


Additional Features: Rimless


Specific Uses For Product: Indoor


Vivarium Type: Aquarium


Pet Type: Fish


Target Species: Fish, aquatic plants, ornamental shrimp


Tank Volume: 21 gallons


Item Dimensions L x W x H: 23.62"L x 13.78"W x 14.96"H


Item Weight: 22.54 kg


Item Shape: Rectangular


Product Style: Rimless 90 degrees Right Angle


Color: Clear


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Wednesday, Oct 14

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

    • favorite tank of all time
Size: 6Gal 14.1" L × 10.2" W × 10.2" H
My most beautiful tank. Unfortunately my fish outgrew it, but it is so gorgeous, it's the perfect size and I received so many compliments on the rimless design.
Reviewed in the United States on July 15, 2026 by Sheela
    • Easy, BEAUTIFUL tank, happy customer
Size: 21Gal 23.6"L×13.7"W×14.9"H
Gorgeous tank for good price (21 gallon). Had no problem with glass top edges. Just heavy for a lid. I usually DIY lids with acrylic and mesh. I deal with evaporation issues, but this all glass top is great. I set tank up by myself, with filter and lights and heater, planted a few plants in substrate. Husband and son lifted tank onto stand. It was IMMACULATELY packed. Looks clear and beautiful on day two. Will move angelfish pair in there (they're still young) when tank is cycled. Totally happy. These clear tanks were made for aqua-sculpting. Love it. Will update when finished. ... show more
Reviewed in the United States on July 17, 2025 by Deborah Salazar
    • Great tank except one thing
Size: 4.6Gal 10.2"L×10.2"W×10.2"H
I wanted to make a nano orchidarium that would just be for plants, but occasionally, for display of poison dart frogs for educational display. As such, it was important for me to have a lid to this, so I was pleased with the inclusion of a glass lid. But, upon getting this, I was a little disappointed that the lid left something to be desired. It does not have a tight fit at all. Not even close to tight. If the plastic wing is put on the back (which is great to be able to cut holes to allow tubes through to maintain a seal), there is probably a 1/4"-3/8" gap around the front and size - maybe larger. Since this is a vivarium, I wanted to have a pretty good seal around it - particularly if I was going to put frogs that could climb out of it. I am still trying to figure out what I will ultimately do - silicone tubing around the edge to keep the seal or laser cut a top. I know that this was not marketed as a vivarium, but I think I would worry a little bit about the top with an aquarium (seems like it would be easy to drop in the tank). Other than that, I'm pleased with this. It is exactly what I'm looking for for a tank for an orchidarium. The finished product looks great. ... show more
Reviewed in the United States on December 14, 2023 by JP Lawrence
    • Shattered!
Size: 34Gal 35.4"L×15.7"W×15.7"H
Review Image by Amazon Customer
Review Image by Amazon Customer
UPDATE.... Amazon gladly replaced the aquarium. The glass is so thick. Tank is gorgeous, I love it! The packaging was the same cheap way as the first one, but somehow made it undamaged. Would have been beautiful! Was not even close to being properly protected especially the bottom which has nothing. The glass is/was gorgeous and very thick. The corners and seams are beautiful as well. Idk if I should go through the wait again if the packaging will be the same. ... show more
Reviewed in the United States on June 6, 2026 by Amazon Customer
    • UPDATE: LEAK AFTER ONE DAY: Did not come with leveling mat
Size: 21Gal 23.6"L×13.7"W×14.9"H
Review Image by Logan Walker
Review Image by Logan Walker
Review Image by Logan Walker
Review Image by Logan Walker
Review Image by Logan Walker
CRUCIAL UPDATE: After a short 48 hours I walked past the tank and identified a pool of water. It is leaking from the back side panel connection. BE AWARE 21 gallon version! $200 for a leaking tank that was beautiful for a short time. I really like this tank size. It is super heavy and sturdy. My lid did not come broken and I truthfully love the style because it has room for my plants to grow out of it. The cleaning cloth is nice, it’s a big size and gets the glass squeaky clean. All that said my tank (21 gallon) did not appear to come with an actual mat. At first I was confused because there was a white fabric that sort of fit the tank but was short. I went back to the description and saw the mat that’s included (according to the picture) is black but I don’t have any black neoprene mat with my tank which is majorly upsetting because I need a mat since this is a rimless tank. So now I have to order a mat that fits the tank but overall the tank itself is gorgeous so far. ... show more
Reviewed in the United States on November 26, 2025 by Logan Walker
    • Great
Size: 15Gal 20.8"L×11.8"W×14.1"H
Review Image by Violet Gage
Review Image by Violet Gage
Review Image by Violet Gage
I purchased the used like new option first and it arrived completely shattered, I had to return it. I ordered the new version and it arrived in one piece. I guess they fixed the lid problem because everything fit and is working. There are no leaks. Part of the glass lid is chipped off, I just noticed that actually. ... show more
Reviewed in the United States on June 7, 2026 by Violet Gage
    • Great quality - beautiful tank
Size: 34Gal 35.4"L×15.7"W×15.7"H
Review Image by Carla S & Michael F Schildgen
Beautiful tank. Arrived quickly and well crated. I’ll post pics when the aquascaping is complete.
Reviewed in the United States on July 28, 2026 by Carla S & Michael F Schildgen
    • Very High Quality Build But Questionable Design Choices
Size: 40Gal 31.5"L×17.7"W×17.7"H
The tank itself is very high quality in terms of the glass and materials, and support is very responsive and helpful, but be careful if you are planning on keeping nano fish or cherry shrimp. The design of the all-in-one versions of this aquarium are not suitable for small fish and they will get sucked into the filtration chambers depending on your setup, as there is an intake on both the top and bottom. Only the bottom intake comes with a cover and even then juvenile and even adult neocaridina can fit through it without issue. Several modifications or additional equipment is needed to try and make things safer, and even then I am still struggling to find the right balance between pre-filtering and keeping the water flowing at an acceptable rate. The filter boxes themselves feel cheap and can probably be replaced. It would also be nice if the filtration chambers were clear so that you could actually see inside of them easily. If you are purchasing a standard tank that is not AIO, you should be fine. ... show more
Reviewed in the United States on June 4, 2026 by Greg

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