Cardinal tetra
Cardinal tetra
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Cardinal Tetra – Freshwater Aquarium Fish Overview
The Cardinal Tetra (Paracheirodon axelrodi) is a vibrant and popular schooling fish, admired for its brilliant red and blue coloration. Slightly larger and hardier than the Neon Tetra, the Cardinal Tetra is ideal for community aquariums. Its peaceful nature and active swimming behavior make it a favorite among both beginner and experienced aquarists.
Appearance & Coloration
Cardinal Tetras feature a striking neon-blue stripe along the top half of the body, complemented by an intense red stripe extending from the mid-body to the tail. These colors shine brightly in planted aquariums, particularly under subdued lighting that mimics their natural habitat.
Key physical traits:
Neon blue stripe along the upper body
Vibrant red stripe from mid-body to tail
Small, streamlined body: 1–1.5 inches
Compact size suitable for nano and community tanks
Behavior & Social Habits
The Cardinal Tetra is a schooling fish that thrives in groups of six or more. They are peaceful, spending most of their time in the top and middle levels of the aquarium, though they occasionally explore lower areas. This active movement adds color and life to any tank.
Behavior highlights:
Peaceful community fish
Active swimmer, schooling behavior
Compatible with small peaceful fish and invertebrates
Caution: May eat very small shrimp or fry
Tank Environment & Water Conditions
Cardinal Tetras thrive in well-planted aquariums with soft, slightly acidic water. Adding driftwood, leaf litter, or shaded areas enhances their natural colors and provides security. Stable water conditions help maintain their health and vibrant hues.
Recommended tank parameters:
Temperature: 64°–82°F (18°–27.7°C)
pH: 5.5–7.0 (more acidic preferred)
Hardness (KH): 4–8 dKH
Minimum tank size: 10 gallons
Feeding & Diet
The Cardinal Tetra is not picky and thrives on a varied diet. A combination of high-quality flakes, micro pellets, frozen or freeze-dried bloodworms, and tubifex ensures vibrant colors and optimal health.
Diet options:
High-quality flakes and pellets
Frozen or freeze-dried bloodworms
Tubifex and small live foods
Omnivorous, easy to feed
