Cardinal Tetra - Paracheirodon axelrodi

Cardinal Tetra (Paracheirodon axelrodi) is a popular tropical freshwater aquarium fish admired for its brilliant blue stripe and vivid red coloration that extends along much of its body. Its small size, peaceful temperament, and striking appearance make it an excellent choice for planted aquariums and community fish tanks with compatible species.

At a Glance

- Common Name: Cardinal Tetra

- Scientific Name: Paracheirodon axelrodi

- Fish Type: Tropical freshwater fish

- Origin: South American Amazon and Orinoco river basins

- Adult Size: Approximately 3–5 cm

- Temperament: Peaceful and social

- Diet: Omnivorous

- Swimming Level: Mainly middle water levels

Distinctive Appearance

The Cardinal Tetra is recognised by its iridescent blue stripe running from the head towards the tail and a bright red stripe extending along the lower side of its body. This combination creates a vibrant contrast that stands out among aquatic plants and darker aquarium backgrounds. Its small, streamlined body makes it especially attractive when swimming in a coordinated group.

Behaviour and Natural Characteristics

Cardinal Tetras are schooling fish that feel more secure when kept in groups. A group of at least six is a common starting point, although larger groups generally create a more impressive display and encourage natural schooling behaviour. Their peaceful nature makes them suitable for community aquariums containing similarly calm fish of an appropriate size.

Feeding and Nutrition

These fish are omnivores and can eat high-quality tropical micro-pellets and finely crushed flakes. Suitable supplementary foods include appropriately sized frozen or live foods, such as baby brine shrimp and daphnia. Offering a varied diet helps support healthy growth and maintain their vibrant coloration.

Aquarium Environment

Cardinal Tetras generally thrive in warm, stable, well-filtered freshwater aquariums with subdued lighting, plants, and open swimming areas. They naturally occur in soft, acidic waters, so stable water conditions are important. Avoid sudden changes in temperature or water chemistry, and ensure the aquarium is fully established before introducing them.

Why Choose Cardinal Tetras?

With their striking colours, peaceful behaviour, and schooling displays, Cardinal Tetras are a beautiful addition to suitable planted and community aquariums. Their vivid appearance works particularly well in groups, creating a lively and colourful underwater scene.

Please read the care information before buying. If you are unsure whether this animal suits your home or experience, contact us first.

Collect from our Mansfield shop, or contact us to confirm whether this animal can be shipped to your location. Weather and local laws may affect live-animal shipping.

Contact us immediately if there is a problem when your order arrives. Unopened dry goods follow the return policy shown on the website.