Cardinal Tetra – Brilliant Red & Blue Freshwater Aquarium Fish
Bring vibrant colour and natural elegance to your aquarium with the Cardinal Tetra (Paracheirodon axelrodi), one of the most beautiful and recognizable freshwater fish in the aquarium hobby.
Known for its brilliant iridescent-blue stripe and vivid red coloration extending along the lower body, the Cardinal Tetra creates a stunning visual display in planted aquariums.
Native to the tropical waterways of South America, these peaceful schooling fish look especially impressive when maintained in larger groups, where their synchronized swimming brings movement and harmony to the aquarium.
Their striking colours contrast beautifully against lush green aquatic plants, dark substrates, natural driftwood, and shaded aquarium backgrounds.
Cardinal Tetras thrive in mature, stable aquariums with soft, slightly acidic water and gentle lighting. A varied diet of quality micro pellets, fine flakes, and small frozen or live foods helps support their health and natural coloration.
Whether you're creating a beautiful planted aquascape or a peaceful South American community aquarium, Cardinal Tetras are an excellent choice for adding colour, elegance, and natural beauty to your underwater world.
Care Guide
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Parameter
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Details
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Scientific Name
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Paracheirodon axelrodi
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Common Name
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Cardinal Tetra
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Origin
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Brazil, Colombia, Venezuela
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Adult Size
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Approximately 3.5–5 cm
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Temperature
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23–29°C
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pH
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3.5–7.5; acidic water preferred
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Water Hardness
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1–12 dGH; softer preferred
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Recommended Tank Size
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75 L+ preferred
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Recommended Tank Length
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60–75 cm+
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Diet
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Omnivore / Small Invertebrates
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Temperament
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Very Peaceful
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Care Level
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Beginner to Intermediate
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Group Size
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10+ recommended
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Lifespan
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Approximately 4–5 years
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Swimming Level
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Middle
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Water Flow
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Gentle to Moderate
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Aquarium Type
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Planted Aquarium / South American Blackwater
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Special Requirements
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Stable water, group housing, shaded areas
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