Best 20-Gallon Fish Tanks of 2025

The Tetra Aquatic Turtle Deluxe Kit 20 Gallons is a complete aquarium kit, perfect for aquatic turtles. The kit includes a decorative filter with cartridges, basking platform, heating lamp, boxwood plant mat, and screen top. The decorative ReptoFilter provides a beautiful waterfall while keeping water clean with 3-stage filtration. The dome lamps in the screen top provide warmth and prime basking. The kit also includes Tetra food and water care product samples, making it convenient to get started. The aquarium measures 30 inches wide x 12 inches deep x 12 inches tall.

The Tetra 20 Gallon Aquarium Kit is a durable, scratch-resistant glass tank that comes with an LED hood, providing natural lighting and a Whisper Filter that keeps the water flow powerful while remaining whisper-quiet. The included artificial plants create a natural ocean feel and reduce fish stress by providing a place to hide. This kit also comes with a Tetra Mini UL Heater and a Boxwood Plant Mat, and all you need to add are gravel and fish to complete your aquarium.

This aquarium starter kit features a 20 U.S. gallon glass tank, a Marina Slim S20 clip on filter with quick change filter cartridges, and includes everything you need to get started with your aquatic home. The kit measures 24 inches L x 12.5 inches W x 16.5 inches H, providing ample space for your fish to swim around.

The Aqueon Aquarium Starter Kit with LED Lighting 20 Gallon includes all necessary equipment for beginners, including a glass aquarium, low profile LED hood, QuietFlow power filter, heater, fish food sample, water conditioner sample, fish net, thermometer, and setup guide. The preset heater keeps the aquarium at a constant 78 degrees Fahrenheit, ideal for tropical fish. The low profile full hood features cool white LED lighting that illuminates the aquatic environment. The filter has a red LED light that signals when it's time to change the cartridge. Add your preferred plants and decor to complete the look.

The GloFish 20 Gallon Kit is a complete aquarium package that includes everything you need to create a stunning underwater display. The blue LED light is the highlight of this kit, as it completely transforms your aquarium and creates a vibrant, neon-like atmosphere. Combined with the GloFish and fluorescent décor, this kit offers a colorful and eye-catching display. The aquarium itself is made in the USA and is built to last with scratch-resistant glass. The kit also includes a heater and filter for optimal water conditions. With its easy setup and all-inclusive features, the GloFish 20 Gallon Kit is perfect for both beginners and experienced aquarists.

The Tetra 20 Gallon Kit is an excellent choice for creating a vibrant aquatic environment for your freshwater fish. It features a glass aquarium with a sleek hinged hood and energy-efficient LED lighting that mimics natural daylight, enhancing the beauty of your setup. The included filtration system ensures your fish thrive by effectively removing debris and toxins, keeping the water clean and clear. With easy setup instructions, you’ll have everything you need to provide a healthy home for your aquatic pets without hassle.

The Aqueon Aquarium Starter Kit is designed to make fishkeeping easy and enjoyable for you. The QuietFlow LED Pro Power Filter ensures your tank water remains clear and healthy for your fish. With a preset heater and thermometer, you can effortlessly maintain the ideal water temperature at 78°F, providing a comfortable environment for your aquatic pets. Additionally, the included tropical fish flakes offer complete nutrition, promoting vibrant and healthy fish. This kit is available in three sizes, allowing you to choose the perfect fit for your space.

The Tetra Goldfish Kit is designed to help you create the perfect home for your goldfish. The glass aquarium comes fully equipped, ensuring you have everything you need to get started. Energy-efficient LED lights brighten the tank, while red LEDs enhance the vibrant colors of your fish, making your aquarium visually striking. The advanced 3-stage filtration system offers thorough mechanical, chemical, and biological filtration, keeping your water clean and healthy for your goldfish. Additionally, the kit includes helpful accessories like a feeding hood, fish food sample, and water conditioner, making setup and maintenance easy for you.

The Ollie & Hutch Tank Stand is designed to support both 10-gallon and 20-gallon aquariums or terrariums, making it versatile for various pets and plants. Its stylish black oak finish adds a classic touch to your space. You'll appreciate the combination of open and hidden storage options, perfect for keeping your cleaning supplies and food neatly organized. Plus, the stand arrives flat-packed for easy shipping, and with two adults recommended for assembly, you’ll have it set up in no time. This sturdy stand can hold tanks weighing up to 240 lbs, ensuring stability for your aquatic or reptilian friends.

The Landen 45P Aquarium Tank is a versatile tank perfect for both freshwater and saltwater aquariums. Its compact design features an integrated filtration system that separates three filter spaces for easy maintenance and cleaning. The tank is made of all glass low iron ultra-clear glass with a beveled edge, and the glass joints are made by a high-quality German silica gel process. The water inlet is detachable and easy to clean, and the tank is designed with an EVA material foam leveling pad to reduce vibration and noise. The back filter chambers can be configured in multiple ways, allowing for DIY filter chamber design. The Landen BIOSMO 700 Return Pump is included, with a max flow rate of 700L/H and max head of 2.5M.