20 Gallon Fish Tanks
11 to 20 Gallons
11 to 20 Gallons
Sort
Filter (1)
$147.92 Chewy Price
($7.40/gl) Price per Unit
$164.29 List Price
Autoship Price
$120.29 Chewy Price
($8.02/gl) Price per Unit
$122.33 List Price
Autoship Price
$109.99 Chewy Price
($5.50/gl) Price per Unit
$189.99 List Price
Autoship Price
$189.99 Chewy Price
($9.50/gl) Price per Unit
Autoship Price
$172.87 Chewy Price
($8.65/gl) Price per Unit
$230.19 List Price
Autoship Price
$224.37 Chewy Price
($16.03/gl) Price per Unit
$349.99 List Price
Autoship Price
$224.99 Chewy Price
($14.07/gl) Price per Unit
$238.99 List Price
Autoship Price
$193.68 Chewy Price
($14.35/gl) Price per Unit
$199.99 List Price
Autoship Price
$239.39 Chewy Price
($14.97/gl) Price per Unit
$265.99 List Price
Autoship Price
$228.22 Chewy Price
$349.99 List Price
Autoship Price
$194.70 Chewy Price
($12.17/gl) Price per Unit
Autoship Price
$261.83 Chewy Price
($4.03/l) Price per Unit
$317.00 List Price
Autoship Price
$282.15 Chewy Price
($14.11/gl) Price per Unit
$313.49 List Price
Autoship Price
$321.13 Chewy Price
($20.08/gl) Price per Unit
$439.99 List Price
Autoship Price
$222.56 Chewy Price
($11.13/gl) Price per Unit
$247.29 List Price
Autoship Price
$380.00 Chewy Price
($31.67/gl) Price per Unit
$440.00 List Price
Autoship Price
$549.99 Chewy Price
($36.67/gl) Price per Unit
Autoship Price
$203.30 Chewy Price
($13.56/gl) Price per Unit
$225.89 List Price
Autoship Price
$199.99 Chewy Price
($12.50/gl) Price per Unit
$200.03 List Price
Autoship Price
$262.19 Chewy Price
($18.73/gl) Price per Unit
$291.32 List Price
Autoship Price
$275.01 Chewy Price
($21.16/gl) Price per Unit
$299.99 List Price
Autoship Price
$219.99 Chewy Price
($15.43/gl) Price per Unit
$220.27 List Price
Autoship Price
$257.44 Chewy Price
($16.09/gl) Price per Unit
$286.04 List Price
Autoship Price
$135.00 Chewy Price
($6.75/gl) Price per Unit
$135.59 List Price
Autoship Price
$21.66 Chewy Price
($10.83/ea) Price per Unit
$24.45 List Price
Autoship Price
$23.07 Chewy Price
($0.73/gl) Price per Unit
$23.23 List Price
Autoship Price
$19.14 Chewy Price
($9.57/ea) Price per Unit
$19.56 List Price
Autoship Price
$20.78 Chewy Price
($10.39/ea) Price per Unit
Autoship Price
Out of Stock
20 Gallon Fish Tanks
A 20-gallon fish tank is a versatile choice, suitable for both beginner and experienced aquarists. It provides ample space for a small community of freshwater or saltwater fish while remaining compact enough to fit on most stands or desktops. Whether you're planning a peaceful planted aquarium or a dynamic reef setup, this mid-sized tank offers the flexibility and volume to bring your vision to life. Benefits of 20-gallon size tanks include:
- Easy to maintain: A 20-gallon fish tank holds enough water to maintain more stable conditions than smaller tanks.
- Versatile stocking options: Suitable for a wide variety of fish, invertebrates, and plants.
- Space-efficient design: Tanks 20 gallons and smaller fit comfortably in apartments, offices, or bedrooms without overwhelming the space.
- Upgrade-friendly: Compatible with a range of filtration, lighting, and heating equipment to support diverse aquarium setups.
- Good for beginner to intermediate use: Offers enough complexity to keep hobbyists engaged, without being overwhelming.
A 20-gallon aquarium is also a great next step when you want to upgrade from a small tank to a larger setup. With Chewy’s wide selection of tanks, tank kits, and accessories, you’ll have everything you need to start or expand your fishkeeping journey. You can even set up Autoship for routine supplies like filters and food to keep your aquatic habitat running smoothly.
Frequently Asked Questions about 20 Gallon Fish Tanks
What kinds of fish can live in a 20-gallon tank?
Many types of fish can live in a 20-gallon tank or smaller. It makes a great habitat for a variety of smaller fish such as tetras, guppies, platies, rasboras, and cory catfish. Be sure to research species compatibility and avoid overcrowding to ensure a healthy environment for your fish.
Is a 20-gallon tank big enough for a beginner?
A 20-gallon tank is big enough for a beginner and small enough not to be too complex. Opinions vary on the ideal size for a starter tank, but many experts recommend the 20-gallon for its manageable size and ease of maintenance. This mid-size capacity provides enough room for stable water conditions, and it can house a greater variety of fish than smaller tanks. These factors help make 20-gallon tanks fairly easy to maintain and very rewarding to manage.
What equipment do I need for a 20-gallon fish tank?
The equipment you need for a 20 gallon fish tank will vary depending on your setup. Saltwater tanks require specialized types of equipment, but freshwater habitats are a bit simpler. For a basic 20-gallon freshwater aquarium setup, you'll usually need a filter, heater (for tropical fish), lighting, substrate, and decorations. Additional equipment like an air pump, thermometer, water testing kit, and a gravel vacuum and siphon for water changes will make it easier for you to maintain a healthy environment for your fish.
Category
Tank Stands
Starter Kits
Acrylic Tanks
Glass Aquariums
Dividers & Covers
Small Tanks & Nano Tanks
Tank Size
Aquarium Type
Fish Type
Material
Product Type
Brand
7 Brands are shown below