Cardinal Tetra

Paracheirodon axelrodi

The Cardinal Tetra is one of the most iconic freshwater fish in the aquarium hobby. Its brilliant neon-blue stripe runs the full length of the body, paired with a vivid red band below — more intensely coloured than the similar Neon Tetra. Found in the blackwater tributaries of the Rio Negro and Orinoco basins, these fish thrive in soft, acidic water with subdued lighting.

Quick Facts

Water Parameters

Natural Habitat

Slow-moving blackwater streams with dense overhanging vegetation, leaf litter, and submerged roots. The water is typically tea-stained with tannins, very soft (GH < 4), and acidic (pH 4.5–6.5).

Feeding

Omnivorous and undemanding. Accepts quality flake food, micro pellets, frozen bloodworms, brine shrimp, and daphnia. Best coloration with a varied diet including live foods.

Compatible Tank Mates

Breeding

Egg scatterer. Breeding is challenging — requires very soft, acidic water (pH ~5.0), dim lighting, and fine-leaved plants or spawning mops. Parents will eat eggs. Fry are extremely small and need infusoria initially.

Care Tips

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