The Cardinal Tetra (Paracheirodon axelrodi) is a vibrant freshwater fish native to the Amazon basin. Known for its neon blue and red horizontal stripes.
Scientific Name
Paracheirodon axelrodi
Habitat
Native to blackwater rivers in Brazil, Colombia, and Venezuela. Prefers acidic, warm waters rich in tannins and vegetation.
Conservation
Not endangered. However, wild populations are impacted by deforestation and over-collection for the aquarium trade.
Lifespan
Can live 3–5 years with optimal care.
Fun Fact
Unlike Neon Tetras, Cardinal Tetras have a red stripe that runs the full length of their body, making them more vibrant.
Diet
Omnivorous – feeds on micro-worms, small insects, and high-quality flakes or frozen food in aquariums.
Average Size
Typically grows up to 2 inches (5 cm).
Location / Placement info
Displayed in the Coastal Reef Exhibit, near the Ocean-View Tunnel
FAQ
What is the lifespan of the Cardinal Tetra?
Cardinal Tetras can live up to 4–5 years in captivity with excellent care and stable water conditions.
What do they eat?
They are omnivores, eating micro pellets, flakes, baby brine shrimp, and daphnia.
Are they aggressive?
No, Cardinal Tetras are peaceful schooling fish ideal for planted community aquariums.
What is the ideal tank size?
A minimum of 15–20 gallons for a small school of 6–10 tetras is recommended.
Do they need a specific environment?
Yes, they thrive in soft, slightly acidic water, dim lighting, live plants, and a gentle flow.
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