Cardinal Tetra (Paracheirodon axelrodi)

The Cardinal Tetra is a stunning freshwater schooling fish prized for its brilliant iridescent blue stripe and vibrant red coloration that extends the full length of its body. Native to the blackwater rivers and tributaries of the Amazon Basin, this iconic species is renowned for its dazzling appearance and peaceful temperament, making it a favorite among aquarists around the world.

Known for their active schooling behavior, Cardinal Tetras thrive when kept in groups of six or more. They are most comfortable in planted aquariums with subdued lighting, driftwood, and open swimming areas that mimic their natural habitat. Their vivid colors stand out beautifully against dark substrates and lush greenery, creating a breathtaking display in community and aquascaped aquariums alike.

Cardinal Tetras are peaceful, social fish that coexist well with other small, non-aggressive species. While they appreciate stable water conditions and a mature aquarium, they are relatively easy to care for and reward hobbyists with constant activity and brilliant coloration. Their combination of beauty, grace, and compatibility has made them one of the most popular tetra species in the aquarium hobby.

Quick Facts:

• Scientific Name: Paracheirodon axelrodi
  
• Common Name: Cardinal Tetra
  
• Adult Size: 1.5–2 inches (4–5 cm)
  
• Temperament: Peaceful
  
• Difficulty Level: Easy to Intermediate
  
• Temperature: 73–82°F (23–28°C)
  
• pH: 4.5–7.0
  
• Diet: Omnivore (flakes, micro pellets, frozen and live foods)
  
• Minimum Tank Size: 15 gallons

With their brilliant blue and red coloration, peaceful disposition, and mesmerizing schooling behavior, Cardinal Tetras are an excellent choice for hobbyists looking to add vibrant color and natural elegance to a planted or community aquarium.