Top 7 Fish Options for Small Tanks Under 2 Feet

Keeping a small aquarium can be a rewarding experience, but choosing the right fish for tanks under 2 feet requires careful thought. Small tanks have limited space and water volume, which means the fish you select must thrive in compact environments without causing stress or water quality issues. This guide highlights seven excellent fish species that fit perfectly in small tanks, offering beauty and personality without overwhelming your setup.

Small aquarium with colorful fish and plants

Why Size Matters in Small Tanks

Small tanks, typically under 24 inches in length, hold less water volume, which makes maintaining stable water conditions more challenging. Fish that grow too large or produce a lot of waste can quickly degrade water quality, leading to health problems. Choosing fish that stay small, have peaceful temperaments, and adapt well to limited space ensures a healthy and enjoyable aquarium.

1. Betta Fish (Betta splendens)

Betta fish are a popular choice for small tanks due to their vibrant colors and flowing fins. They grow to about 2.5 to 3 inches, making them ideal for tanks as small as 5 gallons. Bettas prefer calm water and do well alone since males can be aggressive toward each other.

• Tank size: Minimum 5 gallons

• Temperament: Territorial, best kept solo

• Care: Moderate, needs clean water and gentle filtration

• Diet: Carnivorous, flakes or pellets designed for bettas

  
  

Bettas also enjoy having plants and hiding spots, which help reduce stress and mimic their natural habitat.

2. Neon Tetras (Paracheirodon innesi)

Neon tetras are small, schooling fish known for their striking blue and red stripes. They grow to about 1.5 inches and do best in groups of six or more. Their peaceful nature makes them great for community tanks.

• Tank size: Minimum 10 gallons

• Temperament: Peaceful, schooling species

• Care: Easy, prefers stable water parameters

• Diet: Omnivorous, flakes and small live foods

  
  

Neon tetras add a splash of color and movement to small tanks, especially when paired with live plants.

3. Corydoras Catfish (Corydoras spp.)

Corydoras catfish are bottom dwellers that help keep the tank clean by scavenging leftover food. They grow to about 2 to 3 inches and prefer to live in groups of at least three. Their peaceful nature makes them compatible with many small fish species.

• Tank size: Minimum 10 gallons

• Temperament: Peaceful, social bottom dwellers

• Care: Easy, needs soft substrate to protect barbels

• Diet: Omnivorous, sinking pellets and flakes

  
  

Corydoras add activity to the bottom of the tank and help maintain a clean environment.

Small aquarium with neon tetras and corydoras catfish

4. Dwarf Gourami (Trichogaster lalius)

Dwarf gouramis are colorful and peaceful fish that grow up to 3 inches. They adapt well to small tanks but prefer calm water with plenty of plants and hiding spots. Males are more vibrant and territorial, so it’s best to keep one male per tank.

• Tank size: Minimum 10 gallons

• Temperament: Peaceful but territorial among males

• Care: Moderate, needs clean water and plants

• Diet: Omnivorous, flakes, pellets, and live foods

  
  

Their bright colors and gentle behavior make dwarf gouramis a favorite for small community tanks.

5. Cherry Shrimp (Neocaridina davidi)

While not a fish, cherry shrimp are excellent additions to small tanks under 2 feet. They are tiny, colorful, and help control algae. Cherry shrimp are peaceful and can coexist with small fish species.

• Tank size: Minimum 5 gallons

• Temperament: Peaceful, non-aggressive

• Care: Easy, requires stable water conditions

• Diet: Algae, biofilm, and specialized shrimp food

  
  

Shrimp add diversity and interest to small tanks without adding bioload.

6. Endler’s Livebearer (Poecilia wingei)

Endler’s livebearers are small, colorful fish that grow to about 1.5 inches. They are hardy and active, making them great for beginners. They prefer to live in groups and adapt well to small tanks.

• Tank size: Minimum 10 gallons

• Temperament: Peaceful, schooling fish

• Care: Easy, tolerates a range of water conditions

• Diet: Omnivorous, flakes and live foods

  
  

Their bright colors and lively behavior bring energy to small aquariums.

7. Celestial Pearl Danio (Danio margaritatus)

Celestial pearl danios are tiny fish, about 1 inch long, with beautiful spotted patterns. They are peaceful and do well in groups. Their small size and calm nature make them perfect for tanks under 2 feet.

• Tank size: Minimum 10 gallons

• Temperament: Peaceful, schooling species

• Care: Moderate, prefers planted tanks

• Diet: Omnivorous, flakes and small live foods

  
  

These fish add a delicate charm to small aquariums with their unique appearance.

Planted small aquarium with celestial pearl danios

Tips for Success with Small Tanks