Cardinal Tetra

How To Care For Cardinal Tetra

The Cardinal Tetra (Paracheirodon axelrodi) is a small, colorful freshwater fish native to the Amazon River Basin in South America. Known for its vibrant red and blue coloration, it is one of the most striking and popular species among aquarists. With its peaceful temperament and relatively easy care requirements, the Cardinal Tetra is ideal for community aquariums and small, planted tanks.

Measuring up to 2 inches (5 cm) at full maturity, the Cardinal Tetra is distinguished by its vivid, almost fluorescent blue body, which extends from the tail to the mid-body, and its brilliant red coloration that runs from the mid-body to the tail. This contrast of red and blue creates an eye-catching effect in the aquarium, especially when kept in schools, which is when they show their natural schooling behavior.

In the wild, Cardinal Tetras inhabit the soft, acidic waters of the Amazon River and its tributaries, where they are found in shaded areas with dense vegetation. To replicate these conditions in captivity, it is essential to provide a well-planted tank with plenty of hiding spaces, floating plants, and a dark substrate. These fish prefer dim lighting, which enhances their colors and helps them feel secure.

Cardinal Tetras are omnivorous and will thrive on a varied diet that includes high-quality flakes, micro-pellets, and live or frozen foods such as brine shrimp, bloodworms, and daphnia. A balanced diet is key to maintaining their bright colors and ensuring their overall health.

Due to their small size and peaceful nature, Cardinal Tetras make excellent tankmates for a wide variety of other small, non-aggressive species like neon tetras, rasboras, and dwarf shrimp. However, as they are small, it is important to avoid keeping them with larger, more aggressive species that may see them as prey.

Breeding the Cardinal Tetra in captivity is possible, though it requires specific conditions. They are egg scatterers and typically breed in soft, slightly acidic water at a temperature of around 75°F (24°C). After spawning, the eggs will hatch in about 24-36 hours, and the fry can be raised on infusoria or baby brine shrimp.

With a lifespan of 3 to 5 years, the Cardinal Tetra is a hardy fish that adds a beautiful splash of color to any aquarium. Its peaceful demeanor, striking appearance, and schooling behavior make it a favorite among aquarists of all experience levels, especially those looking to create a lively, colorful display in their freshwater tanks.