Best fish for 20 gallon tank

For all beginners in the fish keeping scene, the common advice as it relates to fish tanks is the bigger, the better for your first tank.The reason being is that bigger fish tank provide the much needed extra space for your fish. Your 20 gallon tank is big, and the extra space it comes with, allows for easier setup and maintenance.

Smaller fish tanks are often an for their limited ability to resisting changes in water chemistry. Your 20 gallon tank on the other hand, houses just the right amount of water to preserve optimal levels of dissolved chemicals in your aquarium.This buffering system helps keep your water quality in tip-top shape for an extended period, which ultimately means fewer and easier maintenance changes on your part.

14 Best fish for 20 gallon tank

  1. Harlequin Rasbora
  2. Mollies
  3. Platy
  4. Swordtail
  5. Cory Catfish
  6. Zebra Danio
  7. Otocinclus catfish
  8. Dwarf Gourami
  9. Neon Tetras
  10. Guppies
  11. Red Cherry Shrimp
  12. Celestial Pearl Danios
  13. Gold Fish 
  14. Endler’s Livebearers

Harlequin Rasbora

  • Care Level:  Easy
  • Temperament: Peaceful
  • Diet: Omnivore
  • Water Conditions:  72° to 81°F
  • Max.Size : Up to 2 inches
  • Family: Cyprinidae
  • Lifespan: 5-8 years

Shoaling fish are very famous for home aquariums because of their fun group behaviors and striking colors. Harlequin Rasboras are a great example of an easy shoaling fish to add to your aquarium. They are a striking fish which, when added as part of a group, will add a vibrant splash of color to your aquarium. They’re easy to care for, and as long as they’re fed a simple diet, and their tank is kept clean, they’ll thrive. They are perfect match for a beginner.

Mollies

  • Care Level:  Easy
  • Temperament:  Peaceful 
  • Diet: Omnivorous
  • Water Conditions:  75-80° F
  • Max.Size : Up to 4.5 inches
  • Family: Poeciliidae
  • Minimum Tank Size:  10 gallons
  • Lifespan: 5 years 
molly fish

Mollies are very versatile fish having the unique ability to live in both saltwater and freshwater if acclimated slowly. What makes these fish super cool is they come in so many different variant colors. You can have yellows, oranges, black and whites, balloon belly, fancy tailed and more. There are a couple basic elements you need to know that really make these fish flourish in the home aquarium.

Platy

  • Care Level:  Easy
  • Temperament:  Peaceful 
  • Diet: Omnivore
  • Water Conditions:   70-77°F 
  • Max.Size : 3 inches
  • Family: Poeciliidae
  • Lifespan: 3 to 5 years 

Platy is a very popular tropical freshwater fish species held by aquarists around the world. Planty fish is extremely beautiful, small fish and come in every single color imaginable. Males grow to about 1.5 inches and females, being a little bigger, can grow up to 2.5 inches. Like most other species from the Poeciliidae family, platies are great fish for both beginners and experienced aquarists. They are easy to keep and breed and their potential are great.

Swordtail

  • Care Level:  Easy
  • Temperament: Aggressive 
  • Diet: Omnivore
  • Water Conditions:   72-82°F 
  • Max.Size : Up to 5 inches (13 cm)
  • Family: Poeciliidae
  • Lifespan: 3 to 5 years 

Swordtail is a very popular species of aquarium fish and it’s a good choice for the beginner aquarist. This is because it is tolerant of a range of conditions and has a very peaceful temperament. As the name suggests swordtails have a long, thin, elongated lower tail. Swordtails are livebearers, meaning they will give birth to live fry rather than eggs.

Cory Catfish

  • Care Level:  Easy
  • Temperament:  Peaceful 
  • Diet: Omnivorous
  • Water Conditions:   60°F – 75°F
  • Max.Size : 0.75-4 Inches
  • Family: Callichthyidae
  • Lifespan: 5 years 

Cory Catfish also called Corydoras Catfish and Cory Fish. This is very popular freshwater fish in pet stores. Cory fish is hardy fish for their size and are staples in freshwater community tanks. Cory Catfish are often described as armored catfish, due to their plates of bone-like material running the length of their bodies. There are many different types of Cory Catfish; all varying in size and color, but Bronze Cory Catfish are probably the most common.

Zebra Danio

  • Care Level:  Easy
  • Temperament:  Peaceful 
  • Diet: Omnivorous
  • Water Conditions:   64-75° F
  • Max.Size : 5 – 7 cm
  • Family: Cyprinidae
  • Lifespan: 5 years 

Zebra Danio is very active and playful fish. Due to their small size, Zebra Danios can survive in tanks as small as 5 gallons, but since they are a community fish, and they can seem hyperactive at times, they are better suited to larger, busier aquariums. We suggest keeping Danios in at least a 10-gallon tank, or even bigger if possible. Zebrafish is loved to swim, so keeping them in a larger tank will help them thrive. Danios are schooling fish, so they need to be kept in groups. As with most other schooling fish, if the numbers are too low, they can become stressed, and start acting out of the ordinary, and can portray symptoms such as aggression towards other tank mates, and loss of appetite.

Otocinclus catfish

  • Care Level:  Easy
  • Temperament:  Peaceful 
  • Diet: Herbivore
  • Water Conditions:   72-82°F 
  • Max.Size : 1-2 inches
  • Family: Loricariidae
  • Lifespan: 3 to 5 years 

Otocinclus Catfish can be a good addition to your tank. This is a peaceful fish that like to keep to their school of buddies. They are the perfect fish in both their calm demeanor and cleaning skills. Otocinclus Catfish will clean glass, plants. They are great at delicately cleaning your greenery and your Catfish with stay happy and healthy eating any particles off the leaves. These fish are also excellent for tanks that have babies or shrimp inside them.

Dwarf Gourami

  • Care Level:   Easy
  • Temperament:  Peaceful
  • Diet: Omnivorous
  • Water Conditions:  72-82° F
  • Max.Size :  4- 4.5 inches
  • Family: Osphronemidae
  • Lifespan: Up to 5 years 

Dwarf Gourami is a very popular and colorful species in freshwater fish-keeping. Their striking coloration and docile nature make them an alluring centerpiece fish in community tanks for aquarists of all skill levels. Dwarf Gourami is generally very peaceful and a great addition to community aquariums.

Neon Tetras

  • Care Level:   Easy
  • Temperament:  Peaceful
  • Diet: Omnivorous
  • Water Conditions:  70-81° F
  • Max.Size :  1.5 inches
  • Family: Characidae
  • Lifespan: Up to 8 years 

The Neon Tetra is also known as neon fish. It is a freshwater fish that belongs to the Characidae family and is known for its dazzling colors and energetic temperament. So much so that around 2 million are sold in the US each month; the vast majority of these are bred in captivity. They are a great, non-aggressive, community fish and spend the majority of their time in the middle of the water column. These fish should generally be kept in schools with at least 15 members. Smaller schools than this can feel threatened and this can cause stress.

Guppies

  • Care Level:   Easy
  • Temperament:  Peaceful
  • Diet: Omnivorous
  • Water Conditions:  70-80° F
  • Max.Size : 0.6 – 2.4 inches
  • Family: Poeciliidae
  • Lifespan: Up to 2 years 
Guppies

The guppy, also known as rainbow fish and million fish, is one of the world's most widely distributed tropical fish, and one of the most popular freshwater aquarium fish species. Aquarium guppies are most popular because you can keep them in a smaller tank and their bio-load is small. These fish is filled with bright colors making them beautiful and fun to watch.

Red Cherry Shrimp

  • Care Level: Easy
  • Temperament: peaceful
  • Diet: Omnivore
  • Water temperature  77-81°F
  • Max.Size : Up to 1.5 inch 
  • Family: Atyidae
  • Lifespan: 1 to 2 Years

The Red Cherry Shrimp (Neocaridina heteropoda) is also known as Cherry Shrimp or RCS, is a dwarf freshwater shrimp native to Taiwan. It is a freshwater Shrimp that is incredibly peaceful and renowned for its algae eating capabilities. Suitable for both beginners and experienced aquarists, it is one of the hardiest and easy to keep Shrimp available. They will add color into any tank which they are placed in and are very undemanding requiring very little upkeep.

Celestial Pearl Danios

  • Care Level:  Medium
  • Temperament: Peaceful
  • Diet: Omnivore
  • Water Conditions:  73-79°F
  • Max.Size :Up to 1 inch
  • Family: Cyprinidae
  • Lifespan: 3-5 Years

Celestial Pearl Danio is a freshwater fish found in small ponds in South East Asia. These fish boasts plenty of color from the white pearl-like spots on their sides to the red coloration on the fins. Discovered within the past decade, aquarium hobbyist have quickly adopted and fallen in love with these little Danios. They are well suited for tanks that are packed with vegetation and other colorful fish that mimic their peaceful nature. It is true that these fish are timid; they work perfectly in communities full of Guppies, Mollies, and Tetras.

Gold Fish

  • Care Level:  Easy
  • Temperament: Peaceful
  • Diet: Omnivore
  • Water Conditions: 68° to 74° F
  • Max.Size : 6 -12+ Inch
  • Family: Cyprinidae
  • Lifespan: 8-10+ years 

Goldfish is considered as a very auspicious fish. This is one of the top most commonly kept aquarium fish. They are a small member of the carp family (which also includes the Prussian carp and the crucian carp), the goldfish is native to East Asia. Many species of gold fish are found in the market. Such as Black, Telescope, Bubble Eye, Lionhead, Oranda, Comet, Fantail, Common Goldfish, Shubunkin, Veiltail, Butterfly tail etc.

Endler’s Livebearers

  • Care Level: Easy
  • Temperament: Relatively peaceful
  • Diet: Omnivore
  • Water Conditions:  77 °F to 83 °F
  • Max.Size :Up to 1.6 inches
  • Family: Osphronemidae
  • Lifespan: 4-5 years

Endler’s livebearers (Poecilia wingei) are a colorful and relatively rare species of guppies. They are found only in Laguna de Patos in Venezuela, which is a large freshwater lake. They are not technically a separate species from the common guppy, and it is believed that they were given the name Poecilia wingei for conservation purposes only.

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