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Cardinal Tetras: Care, Tank Setup, and Tips

Dive into the enchanting realm of Cardinal Tetras (Paracheirodon axelrodi), a must-have for any freshwater aquarium enthusiast. Known for their striking blue and red colors, these small yet vibrant fish bring life and color to any tank. Originating from the Amazon Basin, they thrive in soft, acidic water and are perfect for community tanks due to their peaceful nature.

Cardinal Tetras - Blessings Aquarium

Creating the Perfect Habitat

To replicate their natural environment, aim for a tank size of at least 20 gallons to provide ample swimming space. Use dark substrate to mimic the riverbed and add plenty of plants and driftwood to create hiding spots. Maintaining a temperature between 73°F and 81°F and a pH level of 4.5 to 6.5 ensures a comfortable habitat for your Cardinal Tetras.

Diet and Nutrition

Feeding your Cardinal Tetras a varied diet is key to their health and coloration. Incorporate high-quality flake food, small pellets, and live or frozen foods like brine shrimp and daphnia. Small, frequent feedings are recommended to prevent overeating and maintain water quality.

Social Behavior and Tank Companions

Cardinal Tetras are schooling fish and thrive in groups of six or more, which helps reduce stress and promote natural behavior. They are compatible with other peaceful fish of similar size, making them ideal for community aquariums. Avoid larger, aggressive species to prevent stress and potential harm to your Cardinals.

Health and Maintenance

Regular water changes and monitoring of water parameters are crucial to prevent diseases. Cardinal Tetras are relatively hardy but can be prone to common fish ailments if water quality declines. A well-maintained tank and a balanced diet are your best defenses against health issues.


Cardinal Tetras are a captivating addition to any freshwater aquarium, offering a splash of color and dynamic movement. By providing the right environment, diet, and companions, you can ensure these stunning fish thrive in your aquatic setup. Whether you're a seasoned aquarist or a newcomer to the hobby, Cardinal Tetras are a joy to keep and observe.

For more details visit our YouTube channel : Blessings Aquarium

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