Tetra Cardinal
(Cheirodon axelrodi)

Description

The common name for *Cheirodon axelrodi* is Cardinal Tetra.
It is also known by synonyms like *Paracheirodon axelrodi*, *Hyphessobrycon cardinalis*, and sometimes “red neon tetra” or “scarlet characin.”

**Appearance and Behavior:**
Cardinal Tetras are known for their vibrant colours. They have a brilliant neon-like blue stripe that runs from their nose to their tail, and directly below it, a vivid red stripe that extends the full length of their body. This distinguishes them from Neon Tetras, where the red stripe only goes from mid-body to tail. Their underbelly is a soft white. They are active schooling fish and are generally peaceful, making them suitable for community tanks. They prefer to live in groups of at least six, or ideally 8-10, as larger schools reduce stress and help them display their natural schooling behavior and vibrant colours. They are active during the day and typically swim in the middle water layers. They are relatively shy and prefer dimly lit environments with plenty of plants and hiding spaces.

**Care Level:**
Cardinal Tetras are considered an intermediate care level fish. While not overly difficult for experienced aquarists, they require an established tank with stable and specific water parameters. They are peaceful and compatible with other similar-sized, non-aggressive community fish like other tetras, danios, rasboras, dwarf gouramis, and Corydoras catfish. Avoid keeping them with aggressive or large fish that could intimidate or prey on them, such as angelfish or bettas, unless the tank is very large and well-established.

**Tank Essentials:**
A minimum tank size of 75 litres (20 gallons) is recommended for a school of at least six Cardinal Tetras, though larger tanks are always better for bigger schools. They thrive in soft, acidic water with a pH range typically between 4.6 and 6.2, although some sources suggest they can tolerate a wider range up to 7.0 or even 7.5 in captivity, but ideally below 6.0 for optimal health and color. The water temperature should be stable, ranging from 23-27°C (73-81°F). They prefer subdued lighting, often achieved with floating plants, and a well-planted tank with open swimming areas, driftwood, and leaf litter. Good filtration with low to moderate flow is preferred. Regular small water changes are essential to maintain water quality.

**Diet:**
Cardinal Tetras are omnivores and micropredators. In the wild, their diet consists of small crustaceans, insect larvae, tiny worms, and zooplankton. In the aquarium, they readily accept high-quality flake food, micro pellets, and freeze-dried foods, but they especially appreciate live and frozen options like daphnia, bloodworms, cyclops, and baby brine shrimp. Feed them small amounts multiple times a day, only what they can consume in a few minutes, as they have small mouths and stomachs. A varied diet rich in vitamins is crucial for their health and vibrant coloration.

**Scientific Name:** *Paracheirodon axelrodi* (or *Cheirodon axelrodi* as a synonym)
**Common Name / Variant:** Cardinal Tetra
**Maximum Size:** 5 cm (2 inches)
**Origin:** South America (upper Orinoco and Rio Negro Rivers in Brazil, Colombia, and Venezuela). Most available fish are wild-caught, often from sustainable projects.
**pH Range:** 4.6–6.2 (optimal), tolerates 4.0–7.5 in captivity.
**Temperature:** 23–27°C (73–81°F)
**Lifespan:** 4–5 years in captivity (up to 10 years reported).
**Swimming Zone:** Mid (shoaling), but utilize all areas of the tank.

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Cardinal Tetra: The Vibrant Jewel for Your Community Aquarium

Bring a stunning splash of iridescent blue and vivid red to your freshwater aquarium with the captivating Cardinal Tetra. Watch these active, schooling fish create a mesmerising display!

Overview

The Cardinal Tetra (*Paracheirodon axelrodi*) is celebrated for its striking coloration, featuring a brilliant, neon-like blue stripe running from nose to tail, perfectly complemented by a rich red band directly beneath it. Unlike their close relatives, the red stripe extends the full length of their slender body. These peaceful, active schooling fish are a joy to observe as they gracefully navigate the mid-water column, especially in groups where their vibrant hues truly shine.

Care Level

Considered an intermediate-level fish, Cardinal Tetras thrive in well-established aquariums with stable water conditions. Their gentle nature makes them excellent candidates for peaceful community tanks. Ensure their tankmates are similarly placid and appropriately sized to avoid stress, allowing your Cardinal Tetras to display their best colors and natural schooling behavior.

Tank Essentials

A minimum of 75 litres is recommended for a healthy school of Cardinal Tetras; larger tanks encourage grander schooling. They prefer soft, acidic water with a pH range of 4.6–6.2 and consistent temperatures between 23–27°C. Provide dense planting and subdued lighting to mimic their natural blackwater habitats, offering both cover and open swimming areas.

Diet

Cardinal Tetras are omnivorous micropredators, readily accepting a varied diet. Offer high-quality flake or micro-pellet food, supplemented with frozen or live options like daphnia, brine shrimp, and bloodworms. Feed small amounts multiple times a day to support their active metabolism and maintain their brilliant coloration.

Why Buy From Us

When you buy Cardinal Tetra online from us, you’re choosing healthy aquarium fish nurtured for vitality. We prioritise ethical sourcing and meticulous care, ensuring each fish arrives robust and ready to thrive in your aquatic display. Experience the confidence of expert packing and our commitment to your satisfaction.

• Scientific Name: Paracheirodon axelrodi
• Common Name / Variant: Cardinal Tetra
• Maximum Size: 5 cm
• Origin: South America (Amazon Basin: Rio Negro, Orinoco River)
• pH Range: 4.6–6.2
• Temperature: 23–27°C
• Lifespan: 4–5 years
• Swimming Zone: Mid

Add these dazzling Cardinal Tetras to your cart and transform your aquarium today!

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