Cardinal Tetra | Paracheirodon axelrodi

The Cardinal Tetra is one of the most sought-after freshwater community fish, prized for its brilliant neon red and blue stripes and graceful schooling behavior. Closely related to the Neon Tetra, the Cardinal Tetra is slightly larger, often hardier, and just as peaceful—making it a perfect addition to both beginner and advanced aquariums.

Cardinal Tetras thrive in groups of six or more, creating stunning flashes of color as they swim in unison through the upper and middle levels of the tank. They are well-suited for community aquariums with other small, peaceful fish and larger non-aggressive invertebrates. While adult shrimp are generally safe, tiny shrimp or fry may be eaten.

Being tank-raised, these fish adapt well to a variety of aquarium setups, but they look and feel their best in conditions that mimic their natural South American waters: soft, slightly acidic water enriched with tannins and leaf litter.

With their active schooling nature, vibrant colors, and peaceful disposition, Cardinal Tetras bring both movement and elegance to any aquarium.

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✨ Highlights

• Brilliant neon red and blue coloration

• Peaceful and community-friendly temperament

• Active schooling behavior that adds movement to aquariums

• Great for occupying the upper and middle water column

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🐟 Care Information

• Diet: Omnivorous – accepts flakes, micro pellets, and frozen/freeze-dried foods (bloodworms, tubifex, etc.)

• Social Behavior: Peaceful, schooling/shoaling fish

• Origin: Tank-bred, native to South America

• Adult Size: 1 – 1.5 in (2.5 – 3.8 cm)

• Purchase Size: ¼ – 1 in (0.6 – 2.5 cm)

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🛠 Recommended Tank Parameters

• Temperature: 73° – 81° F (22.7° – 27.2° C)

• pH: 5.5 – 7.0 (slightly acidic preferred)

• KH: 4 – 8 dKH

• Minimum Tank Size: 10 gallons

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✅ Perfect for aquarists looking to add color, movement, and tranquility to their freshwater aquarium.