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20 Best Freshwater Fish For 20 Gallon Tank (2022 Updated)

A good rule of thumb is one gallon of water per one inch of fish, so a 20 gallon tank could theoretically hold 20 one-inch fish. However, it’s best to have fewer fish in a tank so they have more space to swim and grow, and so the tank’s filtration system can more easily handle the waste they produce.

A 20 gallon tank could realistically hold 10-12 small freshwater fish.

20 Best Freshwater Fish For 20 Gallon Tank

Product Image Product Name Features Price

Tetra 20 Gallon Aquarium Kit

  • Original

Marina LED Aquarium Kit 20 Gallon

  • 68-litre glass aquarium
  • Stylish glass aquarium and canopy
  • Long-lasting, natural daylight effect LED lighting module incorporated into aquarium canopy

Fluval FLEX 57L Aquarium Kit, 15 gallon – White

  • 7500K LED lamp supports plant growth and enhances fish colors
  • Fully adjustable White + RGB LEDs for endless color blends
  • FLEXPad remote can also control fun special effects (i.e. fading cloud cover, lightning bolts)

Fluval Flex Saltwater Aquarium Kit 32.5 Gallon Black

  • Foam Filter Blocks with Handles2x.
  • Activated Carbon Inserts2x.
  • BIOMAX InsertsCirculation Pump with Output NozzleFluval Marine 3.

Tetra Aquarium Kit, 55-gal

  • Dimensions (Overall): 50.62 inches (L), 14.87 inches (H) x 23.12 inches (W)
  • Weight: 78.78 pounds
  • Capacity (Volume): 7040 ounces

Fluval Spec III Aquarium Kit – 2.8 Gallon – Black

  • Etched-glass tank with aluminium trim
  • Includes foam block, activated carbon and BioMax bio rings
  • Easy to setup and maintain

Aqueon Aquarium Tank, 20-Gal High

  • High quality glass construction
  • Clean silicone edges
  • For freshwater and marine applications

Clear for Life20R 20-Gallon Rectangle Aquarium – Black

  • 20 Gallon

Aqueon Long Tank Aquarium, Black, 20 Gallons

  • 20 Gallon

Aquarium Tank, Glass, 20 Gal

  • 20 Gal

Tetra 20 Gallon Complete Aquarium Kit w/ Filter Heater LED & Plants

  • Tetra Glass Aquariums are made in the USA and are built to last with scratch resistant glass
  • Artificial Plants add a unique, natural ocean feel while giving your fish a place to hide which reduces fish stress

Nuvo Fusion 20 Pro – AIO 20 Gallon Aquarium Kit – Innovative Marine

  • 20 Gallon

UNS 60U – 20 Gallon Ultra Clear Rimless Aquarium

  • 45° Mitered Edges.
  • 91% Clarity with Diamant Glass.
  • High Quality German Silicon.

Panaview Aquarium Kit with LED Lighting and Power Filter 5-Gallon

  • TRENDY DESIGN: Unique shape allows viewing from multiple angles anywhere in the room.
  • DIMENSIONS: 16.50 L x 10.00 W x 11.80 H Inches.

biOrb Classic 60 Aquarium with MCR – 16 Gallon, Silver

  • Product Code: RBO45746.
  • BiOrb Multi-Cleaning Tool.–>.
  • Decorations NOT included.

20 Gallon Nano Rimless AIO Aquarium | JBJ

  • The integrated overflow skimmer catches large debris from flowing into the filtration system. Flared Nozzle.
  • The directional return nozzle allows for customizable water flow. Ultra Clear Glass.

Tetra AquaArt LED Aquarium Set

  • 100 L

Aqua Dream 200 Gallon Tempered Glass Aquarium White and Silver

  • 200 Gallon
Tetra 20 Gallon Aquarium Kit
  • Original
Marina LED Aquarium Kit 20 Gallon
  • 68-litre glass aquarium
  • Stylish glass aquarium and canopy
  • Long-lasting, natural daylight effect LED lighting module incorporated into aquarium canopy
Fluval FLEX 57L Aquarium Kit, 15 gallon – White
  • 7500K LED lamp supports plant growth and enhances fish colors
  • Fully adjustable White + RGB LEDs for endless color blends
  • FLEXPad remote can also control fun special effects (i.e. fading cloud cover, lightning bolts)
Fluval Flex Saltwater Aquarium Kit 32.5 Gallon Black
  • Foam Filter Blocks with Handles2x.
  • Activated Carbon Inserts2x.
  • BIOMAX InsertsCirculation Pump with Output NozzleFluval Marine 3.
Tetra Aquarium Kit, 55-gal
  • Dimensions (Overall): 50.62 inches (L), 14.87 inches (H) x 23.12 inches (W)
  • Weight: 78.78 pounds
  • Capacity (Volume): 7040 ounces
Fluval Spec III Aquarium Kit – 2.8 Gallon – Black
  • Etched-glass tank with aluminium trim
  • Includes foam block, activated carbon and BioMax bio rings
  • Easy to setup and maintain
Aqueon Aquarium Tank, 20-Gal High
  • High quality glass construction
  • Clean silicone edges
  • For freshwater and marine applications
Clear for Life20R 20-Gallon Rectangle Aquarium – Black
  • 20 Gallon
Aqueon Long Tank Aquarium, Black, 20 Gallons
  • 20 Gallon
Aquarium Tank, Glass, 20 Gal
  • 20 Gal
Tetra 20 Gallon Complete Aquarium Kit w/ Filter Heater LED & Plants
  • Tetra Glass Aquariums are made in the USA and are built to last with scratch resistant glass
  • Artificial Plants add a unique, natural ocean feel while giving your fish a place to hide which reduces fish stress
Nuvo Fusion 20 Pro – AIO 20 Gallon Aquarium Kit – Innovative Marine
  • 20 Gallon
UNS 60U – 20 Gallon Ultra Clear Rimless Aquarium
  • 45° Mitered Edges.
  • 91% Clarity with Diamant Glass.
  • High Quality German Silicon.
Panaview Aquarium Kit with LED Lighting and Power Filter 5-Gallon
  • TRENDY DESIGN: Unique shape allows viewing from multiple angles anywhere in the room.
  • DIMENSIONS: 16.50 L x 10.00 W x 11.80 H Inches.
biOrb Classic 60 Aquarium with MCR – 16 Gallon, Silver
  • Product Code: RBO45746.
  • BiOrb Multi-Cleaning Tool.–>.
  • Decorations NOT included.
20 Gallon Nano Rimless AIO Aquarium | JBJ
  • The integrated overflow skimmer catches large debris from flowing into the filtration system. Flared Nozzle.
  • The directional return nozzle allows for customizable water flow. Ultra Clear Glass.
Tetra AquaArt LED Aquarium Set
  • 100 L
Aqua Dream 200 Gallon Tempered Glass Aquarium White and Silver
  • 200 Gallon

1. Tetra 20 Gallon Aquarium Kit

Tetra 20 Gallon Aquarium Kit

  • Original

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Amazon.com

Product Details

Specifications

Details
Is Discontinued By Manufacturer No
Product Dimensions 27.88 x 16.13 x 20.38 inches; 34.15 Pounds
Country of Origin USA
Item Package Dimensions L x W x H 28.5 x 20.3 x 15.9 inches
Item Dimensions LxWxH 27.88 x 16.13 x 20.38 inches

Reviews From Real Customers

flowerchild65
SpMcneal
Pamella

2. Marina LED Aquarium Kit 20 Gallon

Marina LED Aquarium Kit 20 Gallon

  • 68-litre glass aquarium
  • Stylish glass aquarium and canopy
  • Long-lasting, natural daylight effect LED lighting module incorporated into aquarium canopy
  • Quick change filter system with Marina ‘i’ series filter
  • Convenient easy feeding access

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Amazon.com
eBay
Chewy.com
JoshsFrogs.com

Product Details

Specifications

Details
Is Discontinued By Manufacturer No
Product Dimensions 24 x 12.5 x 16.5 inches; 35 Pounds
Country of Origin China
Item Package Dimensions L x W x H 29.9 x 22 x 18.5 inches
Target Audience Keyword Fish

Reviews From Real Customers

Skyler
JustAFishServant
Melody

3. Fluval FLEX 57L Aquarium Kit, 15 gallon – White

Fluval FLEX 57L Aquarium Kit, 15 gallon - White

  • 7500K LED lamp supports plant growth and enhances fish colors
  • Fully adjustable White + RGB LEDs for endless color blends
  • FLEXPad remote can also control fun special effects (i.e. fading cloud cover, lightning bolts)
  • Powerful 3-stage filtration for superior water quality
  • Oversized mechanical (foam), chemical (carbon) and biological (Biomax) media included

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Sold By Price
Amazon.com – Seller
Walmart – joshsfrogs
SaltwaterAquarium.com
Pets Warehouse

Product Details

Specifications

Details
Is Discontinued By Manufacturer No
Product Dimensions 15.75 x 11.81 x 19.69 inches; 28.04 Pounds
Country of Origin China
Item Package Dimensions L x W x H 20.08 x 19.69 x 19.61 inches
Item Dimensions LxWxH 15.75 x 11.81 x 19.69 inches

Reviews From Real Customers

jscl
El

4. Fluval Flex Saltwater Aquarium Kit 32.5 Gallon Black

Fluval Flex Saltwater Aquarium Kit 32.5 Gallon Black

  • Foam Filter Blocks with Handles2x.
  • Activated Carbon Inserts2x.
  • BIOMAX InsertsCirculation Pump with Output NozzleFluval Marine 3.

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Sold By Price
Amazon.com – Seller
eBay – countryfishgirl
SaltwaterAquarium.com
Fish Tanks Direct

Product Details

5. Tetra Aquarium Kit, 55-gal

Tetra Aquarium Kit, 55-gal

  • Dimensions (Overall): 50.62 inches (L), 14.87 inches (H) x 23.12 inches (W)
  • Weight: 78.78 pounds
  • Capacity (Volume): 7040 ounces
  • Intended Pet Type: Fish
  • Material: Glass

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Amazon.com
eBay

Product Details

Specifications

Details
Product Dimensions 51.9 x 24.4 x 16.4 inches; 79 Pounds
Country of Origin USA
Item Package Dimensions L x W x H 52.3 x 24.5 x 17.2 inches
Target Audience Keyword Fish
Directions See label

Reviews From Real Customers

brad
peter
bcarran

6. Fluval Spec III Aquarium Kit – 2.8 Gallon – Black

Fluval Spec III Aquarium Kit - 2.8 Gallon - Black

  • Etched-glass tank with aluminium trim
  • Includes foam block, activated carbon and BioMax bio rings
  • Easy to setup and maintain
  • Excellent starter and decorative fish tank

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Sold By Price
Amazon.com – Seller
eBay
Walmart – joshsfrogs
Chewy.com

Product Details

Specifications

Details
Is Discontinued By Manufacturer No
Product Dimensions 10.8 x 11.8 x 8.7 inches; 4.85 Pounds
Country of Origin China
Item Package Dimensions L x W x H 12.6 x 11.73 x 9.84 inches
Directions Follow individual packaging instructions.

Reviews From Real Customers

Marieblu
Vettegirl
igotchu

7. Aqueon Aquarium Tank, 20-Gal High

Aqueon Aquarium Tank, 20-Gal High

  • High quality glass construction
  • Clean silicone edges
  • For freshwater and marine applications
  • Not eligible for price match

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Sold By Price
Amazon
Petco.com
SaltwaterAquarium.com
Tropics Aquarium Professionals

Product Details

Specifications

Details
Manufacturer Part Number 015905100205
Product Name Aquarium
Product Type Aquarium
Tank Capacity 20 gal
Shape Rectangle

Reviews From Real Customers

steven3
dvd_nj

8. Clear for Life20R 20-Gallon Rectangle Aquarium – Black

Clear for Life20R 20-Gallon Rectangle Aquarium - Black

  • 20 Gallon

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Amazon
Dog.com
1800PetSupplies
KV Supply

Product Details

Specifications

Details
Background Color Clear

9. Aqueon Long Tank Aquarium, Black, 20 Gallons

Aqueon Long Tank Aquarium, Black, 20 Gallons

  • 20 Gallon

Check Latest Price

Sold By Price
Amazon
eBay – valuepetsupplies
Petco.com
Bay Bridge Aquarium and Pet

Product Details

Specifications

Details
Manufacturer Part Number 015905100212
Product Name Aquarium
Product Type Aquarium
Tank Capacity 20 gal
Shape Rectangle

10. Aquarium Tank, Glass, 20 Gal

Aquarium Tank, Glass, 20 Gal

  • 20 Gal

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Sold By Price
Amazon
Carolina Biological

Product Details

11. Aquaculture Aquarium 20H Gallon Ecom 20H

Aquaculture Aquarium 20H Gallon Ecom 20H

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Amazon
Walmart

Product Details

Specifications

Details
Animal Type Fish
Assembled Product Weight 30.6 lb
Assembled Product Dimensions (L x W x H) 27.25 x 17.75 x 21.00 Inches

Reviews From Real Customers

Candie

12. Tetra 20 Gallon Complete Aquarium Kit w/ Filter Heater LED & Plants

Tetra 20 Gallon Complete Aquarium Kit w/ Filter Heater LED & Plants

  • Tetra Glass Aquariums are made in the USA and are built to last with scratch resistant glass
  • Artificial Plants add a unique, natural ocean feel while giving your fish a place to hide which reduces fish stress
  • Aquarium Dimensions: 24.2″ L x 12.4″ W x 16.7″ H

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Sold By Price
Amazon
eBay – alvsyah-0
Walmart
Melowis

Product Details

Specifications

Details
Dimensions 25 × 13 × 17 in
Shape Rectangle (Standard)
Stand Material Plastic
Tank Capacity 20 gal
Tank Material Acrylic

Reviews From Real Customers

ABQLori

13. Cube 20 Nano AIO Aquarium – Waterbox | Waterbox Aquariums

Cube 20 Nano AIO Aquarium - Waterbox | Waterbox Aquariums

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Amazon
Waterbox USA
BulkReefSupply.com

Product Details

Specifications

Details
Dimensions 17.7″L x 17.7″W x 15.7″H
Glass Thickness 6mm (1/4″)
Water Height 15.2″
Aquarium Volume 20 Gallons
Aquarium Dry Weight 43 lbs

Reviews From Real Customers

Trevor H.
Dan B.
Madmartigan

14. Nuvo Fusion 20 Pro – AIO 20 Gallon Aquarium Kit – Innovative Marine

Nuvo Fusion 20 Pro - AIO 20 Gallon Aquarium Kit - Innovative Marine

  • 20 Gallon

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Amazon
eBay
Innovative Marine
Pets Warehouse

Product Details

Specifications

Details
Is Discontinued By Manufacturer No
Target Audience Keyword Fish
Specific Uses for Product Indoor
Style Modern

15. UNS 60U – 20 Gallon Ultra Clear Rimless Aquarium

UNS 60U - 20 Gallon Ultra Clear Rimless Aquarium

  • 45° Mitered Edges.
  • 91% Clarity with Diamant Glass.
  • High Quality German Silicon.
  • Laser Etched Logo.
  • Black Leveling Mat Hassle-free tank deliveries!

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Sold By Price
Amazon
Buceplant.com

Product Details

Specifications

Details
Glass thickness 6mm

Reviews From Real Customers

Lauren A.
Lizzy A.

16. Panaview Aquarium Kit with LED Lighting and Power Filter 5-Gallon

Panaview Aquarium Kit with LED Lighting and Power Filter 5-Gallon

  • TRENDY DESIGN: Unique shape allows viewing from multiple angles anywhere in the room.
  • DIMENSIONS: 16.50 L x 10.00 W x 11.80 H Inches.
  • INCLUDES: User Set-Up Instructions and Koller Products premium filter cartridge.

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Amazon
eBay
Kaplan Early Learning Company
Aquascaping Pro

Product Details

Specifications

Details
Product Dimensions 16.5 x 10 x 11.8 inches; 4.8 Pounds
Item Package Dimensions L x W x H 17.04 x 12.56 x 11.73 inches
Item Dimensions LxWxH 16.5 x 10 x 11.8 inches
Directions Pulled from Packaging
Age Range Description Beginners to Advanced

Reviews From Real Customers

jet.com
elz3971.04ieznyjxx

17. biOrb Classic 60 Aquarium with MCR – 16 Gallon, Silver

biOrb Classic 60 Aquarium with MCR - 16 Gallon, Silver

  • Product Code: RBO45746.
  • BiOrb Multi-Cleaning Tool.–>.
  • Decorations NOT included.

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Amazon
The Pond Outlet
Soxy

Product Details

Specifications

Details
Diameter 11.75 in
Volume 4 gallons
Weight (full) 35 lbs
Frequency 50-60Hz, single phase
Voltage 12V AC

Reviews From Real Customers

molly.s

18. 20 Gallon Nano Rimless AIO Aquarium | JBJ

20 Gallon Nano Rimless AIO Aquarium | JBJ

  • The integrated overflow skimmer catches large debris from flowing into the filtration system. Flared Nozzle.
  • The directional return nozzle allows for customizable water flow. Ultra Clear Glass.
  • Low-iron glass provides excellent clarity for an uncompromising view of your aquarium. Filter Media Included.
  • The filtration chamber has been redesigned to maintain a stable water level in the central column to allow a protein skimmer to be used.

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eBay – saltwateraq
SaltwaterAquarium.com
AquaCave.com
Lax Aquarium

Product Details

Specifications

Details
Glass Thickness 5 mm

19. Tetra AquaArt LED Aquarium Set

Tetra AquaArt LED Aquarium Set

  • 100 L

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Vivapets

Product Details

Reviews From Real Customers

tierbedarf-discount.ch
mascotaplanet.com

20. Aqua Dream 200 Gallon Tempered Glass Aquarium White and Silver

Aqua Dream 200 Gallon Tempered Glass Aquarium White and Silver

  • 200 Gallon

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Aquadream
AquadreamWholesale
Audacia Home

Product Details

Specifications

Details
Water Actual Capacity 155 Gallons
Glass thickness 0.47 inches
Water Capacity 45 Gallons

Conclusion

A 20 gallon tank is a great size for a freshwater fish tank. You can keep a wide variety of fish in a 20 gallon tank, from small fish like guppies and neon tetras to larger fish like angels and gouramis.

When choosing fish for your 20 gallon tank, it’s important to consider the fish’s adult size, temperament, and swimming needs. It’s also important to choose fish that are compatible with each other. A 20 gallon tank can accommodate a wide variety of fish, so you’re sure to find the perfect fish for your tank.

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