Cardinal Tetra: A Vibrant Addition to Your Aquarium
The Cardinal Tetra is one of the most iconic freshwater aquarium fish, known for its vibrant neon blue stripe and deep red coloration running the full length of its body. These XXL specimens are larger, more developed fish with stronger colour and presence compared to standard juveniles.
Cardinal Tetras are peaceful schooling fish that truly shine when kept in groups, creating stunning movement and colour in planted aquariums.
At N8 Aquatics, our Cardinals are carefully quarantined and conditioned on high-quality foods, ensuring strong, healthy fish ready for your aquarium.
Species Snapshot
- Size Sold: 3.5 cm+ (XXL juveniles)
- Adult Size: 4–5 cm
- Tank Size: 60 L minimum (larger recommended)
- Temperament: Peaceful schooling fish
- Temperature: 24–30°C
- pH: 4.5 – 7.0
- Difficulty: Moderate
Key Information
- Scientific Name: Paracheirodon axelrodi
- Common Name: Cardinal Tetra
- Current Size: Approximately 3.5 cm+
- Adult Size: Up to 5 cm
- Temperament: Peaceful
- Difficulty Level: Moderate
Recommended Tank Setup
Cardinal Tetras thrive in planted aquariums that replicate soft, natural environments.
Recommended aquascape:
- dense plant coverage
- driftwood and leaf litter
- subdued lighting
- dark substrate
They display best colours in slightly dim environments.
Water Parameters
Cardinals prefer soft, stable water conditions.
- Temperature: 24–30°C
- pH: 4.5 – 7.0
- GH: 1 – 8 dGH
- Water Flow: Low to moderate
Diet
Cardinal Tetras are omnivores and benefit from a varied diet.
Recommended foods include:
- live brine shrimp (N8 Aquatics recommended)
- frozen foods
- micro pellets
- high-quality flakes
Compatibility
Suitable tankmates include:
- other small tetras
- dwarf cichlids
- Corydoras
- peaceful community fish
Avoid large or aggressive fish.
Behaviour
Cardinals are active schooling fish that feel most secure in groups of 6 or more. Larger groups create more natural behaviour and stronger colouration.
Why Buy From N8 Aquatics
- XXL premium-sized fish
- Carefully conditioned post-import
- Strong, healthy stock
- Fed high-quality diet including live foods
Pickup Information
N8 Aquatics currently operates as a local pickup-only breeder in Central Queensland.
Orders are collected by appointment after purchase confirmation.
Please ensure you are able to collect your fish before placing an order.
Important
All livestock sold by N8 Aquatics should be introduced to fully cycled aquariums suitable for the species being kept.
Please ensure your aquarium setup and tankmates are appropriate before purchasing.
Overview of the Cardinal Tetra XXL (3cm)
The Cardinal Tetra is one of the most recognizable and beloved freshwater fish among aquarium enthusiasts. At a size of 3cm, the Cardinal Tetra XXL stands out with its brilliant red and blue colors, offering an energetic and eye-catching presence in any tank. Known for its peaceful temperament, the Cardinal Tetra makes a perfect choice for community aquariums. This vibrant fish thrives in well-maintained freshwater environments, contributing both visual appeal and lively movement to your aquatic setup.
Care and Habitat Requirements
To maintain the brilliant colors and health of the Cardinal Tetra, it’s important to provide a habitat that mimics its natural environment. These fish prefer soft, slightly acidic water with a temperature range between 23°C and 27°C (73°F to 81°F). Moderate lighting and plenty of plant cover encourage comfortable, natural behavior. Regular water changes and good filtration are essential to keep water quality high, which in turn supports the vibrant colors and overall well-being of the Cardinal Tetra.
Feeding and Behavior
Cardinal Tetras are omnivorous and thrive on a balanced diet of high-quality flakes, micro pellets, and occasionally live or frozen foods such as brine shrimp or daphnia. They are schooling fish and feel safest in groups of six or more, displaying graceful schooling patterns that enhance tank aesthetics. Their peaceful nature makes them compatible with many other small to medium non-aggressive fish species, contributing to a harmonious community aquarium.