Looking to add a touch of underwater wonder to your home or office? Our collection of 4-gallon fish tanks offers the perfect solution for those looking to create a beautiful aquatic environment for their finned friends. With their compact size and sleek design, these tanks are ideal for small spaces, making them a great choice for beginner fish keepers or experienced aquarists looking to expand their collection. Whether you're interested in setting up a stunning centerpiece or providing a cozy home for your betta fish, our 4-gallon fish tanks provide the perfect combination of functionality and style. Dive into our selection today and discover the perfect tank to bring your underwater dreams to life!

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biOrb FLOW 15 White Aquarium with Standard Light 4 Gallon
(0)
$127.83 was $146.99
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With chic and mimalist design a biOrb FLOW 15 aquarium makes it effortless for you to elevate any space. This 4-gallon acrylic aquarium with three transparent sides is compact...
biOrb CLASSIC 15 Black Aquarium with MCR Light 4 Gallon
(0)
$111.99 was $143.99
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These breathtaking underwater worlds add a sense of joy and wonder to your home. With chic and mimalist design a biOrb CLASSIC 15 MCR aquarium makes it effortless for you to...
biOrb LIFE 15 Black Aquarium with Standard Light 4 Gallon
(0)
$127.83 was $146.99
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With chic and mimalist design a biOrb LIFE 15 aquarium makes it effortless for you to elevate any space. This 4-gallon acrylic aquarium is designed to perfectly frame your biOrb...
biOrb LIFE 15 White Aquarium with Standard Light 4 Gallon
(0)
$111.09 was $146.99
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With chic and mimalist design a biOrb LIFE 15 aquarium makes it effortless for you to elevate any space. This 4-gallon acrylic aquarium is designed to perfectly frame your biOrb...
biOrb LIFE 15 White Aquarium with MCR Light 4 Gallon
(0)
$194.99
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With chic and mimalist design a biOrb LIFE 15 MCR aquarium makes it effortless for you to elevate any space. This 4-gallon acrylic aquarium is designed to perfectly frame your...
biOrb LIFE 15 Transparent Aquarium with Standard Light 4 Gallon
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$111.09 was $146.99
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With chic and mimalist design a biOrb LIFE 15 aquarium makes it effortless for you to elevate any space. This 4-gallon acrylic aquarium is designed to perfectly frame your biOrb...
Fluval Flex Aquarium Kit
(50)
$191.99
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I love Fluval tanks because they are so well-made, but this tank has a few flaws for specific fish and invertebrates. ...The bowed front shape is also visibly striking. The 15...

Pros: quietness, light, great tank
biOrb CLASSIC 15 Black Aquarium with Standard Light 4 Gallon
(7)
$99.16 was $103.99
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beautiful tank...We are still searching for a way to light up the tank......My betta loves this tank a lot more than his previous one gallon home.

Pros: design, filter, filter change
biOrb HALO 15 Grey Aquarium with MCR Light 4 Gallon
(3)
$139.99 was $143.99
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Interesting tank to buy. Good size for most nano fish that can be housed in a 5 gallon or less.. it is awkward to install a heater in it..

Pros: size, live plants
biOrb LIFE 15 Transparent Aquarium with MCR Light 4 Gallon
(1)
$194.99
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These breathtaking underwater worlds add a sense of joy and wonder to your home. With chic and minimalist design a biOrb LIFE 15 aquarium makes it effortless for you to elevate...

Pros: great product, perfect fit
Imagitarium Semi-Hexagonal Aquarium Kit 6.7 GAL
(124)
$64.99
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Imagitarium 6.7 gallon semi hexagonal fish tank...Great little tank easy setup.multicolored ight system. highly recommended....This is a perfect tank for small fish,dwarf frogs,shrimp...

Pros: light, design, filter
biOrb LIFE 15 Black Aquarium with MCR Light 4 Gallon
(0)
$194.99
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These breathtaking underwater worlds add a sense of joy and wonder to your home. With chic and minimalist design a biOrb LIFE 15 aquarium makes it effortless for you to elevate...
biOrb TUBE 15 Black Aquarium with Standard Light 4 Gallon
(0)
$162.19 was $201.99
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With chic and mimalist design a biOrb TUBE 15 aquarium makes it effortless for you to elevate any space. This 4-gallon acrylic aquarium is designed with cyldrical contourg and...
biOrb TUBE 15 Black Aquarium with MCR Light 4 Gallon
(0)
$233.99
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With chic and mimalist design a biOrb TUBE 15 aquarium makes it effortless for you to elevate any space. This 4-gallon acrylic aquarium is designed with cyldrical contourg and...
biOrb TUBE 15 White Aquarium with MCR Light 4 Gallon
(0)
$233.99
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With chic and mimalist design a biOrb TUBE 15 MCR aquarium makes it effortless for you to elevate any space. This 4-gallon acrylic aquarium is designed with cyldrical contourg...
biOrb HALO 15 White Aquarium with MCR Light 4 Gallon
(0)
$143.99
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These breathtaking underwater worlds add a sense of joy and wonder to your home. With chic and mimalist design a biOrb HALO 15 MCR aquarium makes it effortless for you to elevate...
biOrb Black LOOP 15 Aquarium with Standard Light 4 Gallon
(0)
$160.64 was $197.99
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The biOrb LOOP 15 aquarium has a chic and minimalist design that's compact size is ideal for desktop or tabletop display. This 4-gallon (15 L) aquarium has a unique elliptical...
Penn Plax Cube Hideaways 4.25" L X 4.5" W Pack of 3
(1)
$32.99
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Penn-Plax's cubes offers visual interest to your tank while reducing fish stress. It features swim throughs and hideaways for small and medium sized fish. This will make a great...

Pros: smell
biOrb Black LOOP 15 Aquarium with MCR Light 4 Gallon
(0)
$176.50 was $227.99
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The biOrb LOOP 15 MCR aquarium has a chic and minimalist design that's compact size is ideal for desktop or tabletop display. This 4-gallon (15 L) aquarium has a unique elliptical...
biOrb White LOOP 15 Aquarium with MCR Light 4 Gallon
(0)
$227.99
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The biOrb LOOP 15 MCR aquarium has a chic and minimalist design that's compact size is ideal for desktop or tabletop display. This 4-gallon (15 L) aquarium has a unique elliptical...
biOrb FLOW 15 Black Aquarium with Standard Light 4 Gallon
(0)
$131.77 was $146.99
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With chic and mimalist design a biOrb FLOW 15 aquarium makes it effortless for you to elevate any space. This 4-gallon acrylic aquarium with three transparent sides is compact...
JBJ AquaZen Rimless Desktop Aquarium 4 Gallon
(0)
$44.99
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Transform your space into a tranquil oasis with Aquazen's ZenScape the ultimate tank for freshwater plant enthusiasts. Enjoy a crystal-clear view of your aquatic oasis with the...
biOrb FLOW 15 Black Aquarium MCR Light 4 Gallon
(0)
$194.99
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With chic and mimalist design a biOrb FLOW 15 MCR aquarium makes it effortless for you to elevate any space. This 4-gallon acrylic aquarium with three transparent sides is compact...
AquaZen Rimless Desktop Freshwater Planted Tank Kit 12" L X 10" W X 8" H 4 Gallon
(0)
$134.99
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Transform your space into a tranquil oasis with Aquazen's ZenScape the ultimate complete tank kit for freshwater plant enthusiasts. Crafted with precision this low iron rimless...

4 Gallon Fish Tanks

At Petco, we carry a great selection of 4 gallon fish tanks. Our 4 gallon fish tanks are perfect for beginner pet parents looking to add a new aquatic pet to their home. These compact aquariums provide plenty of room for your pet to swim and explore while still fitting nicely on any desk or tabletop in your home.