The Cardinal Tetra, scientifically known as Paracheirodon axelrodi, is a small, vibrant freshwater fish belonging to the Characidae family. These tetras are native to the Orinoco and Rio Negro basins in South America, specifically found in Brazil, Colombia, and Venezuela. Cardinal tetras are prized for their striking appearance and peaceful nature, making them a popular choice for community aquariums. They typically grow to about 2 inches (5 cm) in length and have a lifespan of up to 5 years in captivity when provided with proper care.
Habitat and Tank Requirements:
In their natural habitat, cardinal tetras are found in slow-moving, shaded blackwater streams with abundant vegetation. The water in these environments is typically soft, acidic, and rich in tannins, which contribute to its dark coloration. To replicate these conditions in captivity, it is important to provide a tank with appropriate water parameters and aquascaping.
Tank Size and Water Parameters:
| PARAMETER | RECOMMENDED |
|---|---|
| Tank Size | Minimum 40 litres |
| Temperature | 73-81°F (23-27°C) |
| pH | 4.0-7.0 (Ideal: 5.5-6.5) |
| Hardness | Soft water, 1-4 dGH |
This table provides the optimal water conditions for keeping Cardinal Tetras healthy and displaying their vibrant colors. These tetras thrive in soft, slightly acidic water, replicating the conditions of their natural habitat in the Amazon basin. Maintaining stable water parameters and providing a well-planted environment are key to their well-being in a home aquarium.
Cardinal tetras prefer a dark substrate such as sand or fine gravel, which not only mimics their natural environment but also enhances their vibrant colors. Low to moderate lighting is recommended to create a comfortable and natural setting, as these fish are accustomed to dim, shaded areas in the wild. The tank should be heavily planted with live plants, driftwood, and leaf litter to provide hiding spots and simulate their natural habitat. Floating plants can also be used to diffuse light and create a more shaded environment. A gentle filter is ideal, as these fish prefer calm waters. A sponge filter is often recommended to avoid excessive water movement.
We Recommend:
These carefully selected options provide a well-balanced nutritional profile, ensuring that your fish receive the essential nutrients they need for optimal growth, vibrant colors, and overall health. By offering a variety of these high-quality foods, you can help maintain the vitality and well-being of your fish, promoting a healthy and thriving aquarium environment.
Behavior and Compatibility:
Cardinal tetras are peaceful schooling fish that exhibit their best colors and most natural behavior when kept in groups of at least 6-10 individuals. They are an excellent choice for community tanks and get along well with other small, peaceful fish, such as other tetras, rasboras, and small catfish like Corydoras. However, they should not be housed with larger, aggressive fish that might see them as prey.
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