Overview:
Cardinal tetras (Paracheirodon axelrodi) are vibrant schooling fish known for their brilliant blue and red stripes, making them a stunning addition to freshwater aquariums. These fish are native to slow-moving rivers and streams in the Amazon Basin, where they thrive in soft, acidic water. In aquariums, they require stable water conditions and benefit from being kept in schools of at least six or more, which reduces stress and allows them to display natural behaviors.

With their peaceful nature, cardinal tetras are ideal for community tanks, but they should only be housed with other non-aggressive species. Their care is relatively straightforward, though they are best suited for slightly experienced aquarists due to their sensitivity to water changes.

Common Name: Cardinal Tetra
Scientific Name: Paracheirodon axelrodi

Origin: Native to the Amazon Basin (Brazil, Colombia, Venezuela)

Maximum Size: 2 inches (5 cm)

Cardinal Tetra Care:
Tank Parameters Required:

• Minimum Tank Size: 20 gallons (76 liters)

• pH Range: 5-7.6

• Hardness: 1-6 dGH

• Temperature: 22-28°C (72-82°F)

Temperament: Peaceful
Tank Level: Mid-dweller
Diet: Omnivore (requires high-quality flakes, micro-pellets, and occasional live/frozen food)
Breeding: Egg-layer (difficult in home aquariums)
Difficulty: Intermediate (sensitive to water changes and quality)

Around 1.5”-1.8”. Large Size Cardinal Tetras.

These were raised in hard water. 

Note:All pictures shown are for illustration purposes only. Variations can occur in livestock.