The Cardinal Tetra (Paracheirodon axelrodi) is another popular and strikingly beautiful freshwater fish that is closely related to the Ember Tetra. Here's a rundown on Cardinal Tetras:
Appearance: Cardinal Tetras are known for their vibrant colors. They have a bright neon blue body with a horizontal red stripe that runs from the nose to the base of the tail. They grow slightly larger than Ember Tetras, reaching up to 1.5 inches (3.8 cm) in length.
Tank Requirements: Similar to Ember Tetras, Cardinal Tetras are schooling fish and should be kept in groups of at least 6 individuals. They require a tank size of at least 10 gallons (38 liters) or more. Provide them with plenty of plants (live or artificial) for hiding and swimming space.
Water Parameters: Cardinal Tetras prefer soft to slightly acidic water conditions. Ideal water parameters include a temperature range of 73-81°F (23-27°C), pH of 5.0-7.0, and very soft to moderately hard water (2-12 dGH).
Diet: They are omnivores and will readily accept high-quality flakes, pellets, and frozen or live foods such as bloodworms, brine shrimp, and daphnia. A varied diet helps maintain their health and coloration.
Behavior: Cardinal Tetras are peaceful and should be kept with other peaceful species of similar size. They can sometimes be a bit timid, so avoid keeping them with larger or aggressive fish that might intimidate them.
Breeding: Breeding Cardinal Tetras can be more challenging compared to Ember Tetras. They require very soft and acidic water with a temperature slightly higher than usual (around 80-82°F or 27-28°C). They scatter their eggs among fine-leaved plants, and the adults should be removed after spawning to prevent them from eating the eggs.
Compatibility: Good tankmates for Cardinal Tetras include other small, peaceful fish like other tetras (e.g., Neon Tetras), rasboras, dwarf corydoras catfish, and small peaceful bottom dwellers like otocinclus catfish.
In summary, Cardinal Tetras are prized for their striking coloration and peaceful demeanor, making them a popular choice for community aquariums. With proper care and suitable tankmates, they can thrive and bring vibrant beauty to your aquarium.
