Cardinal Tetra

Cardinal Tetra - Brilliant Red and Blue Iridescence for the Planted Tank

The Cardinal Tetra is instantly recognisable for its brilliant iridescent blue stripe running the full length of its body over a vivid red lower half, a combination that has made it a planted-tank staple for generations of aquarists.

Kept in a tight school under good lighting, cardinal tetras produce one of the most striking colour displays in the freshwater hobby, their iridescence intensifying as they settle into a well-planted, calm environment.

At N8 Aquatics, our fish are carefully raised and conditioned to ensure healthy stock suited to home aquariums.

Species Snapshot

• Adult Size: 4–5 cm
• Tank Size: 60 L minimum, keep in a group of 6 or more
• Temperament: Peaceful schooling fish
• Temperature: 23–27°C
• pH: 6.0–7.5
• Difficulty: Easy

Ideal Habitat and Care

A planted tank with gentle flow and a good-sized school lets this species display its natural colour and relaxed schooling behaviour.

• Temperature: 23–27°C
• pH: 6.0–7.5
• Water Flow: Low to moderate
• Maintenance: Weekly partial water changes of 20–30%

Diet

This species is an easy feeder that will happily accept a varied diet.

• High-quality micro pellet or flake as a daily staple
• Frozen daphnia and bloodworm for variety
• Frozen or live brine shrimp to bring out colour

Compatibility

A classic peaceful community fish, it thrives alongside a wide range of similarly gentle species.

Suitable tankmates include:

• Other tetra and rasbora species
• Corydoras catfish
• Dwarf gourami and shrimp-safe community fish

Avoid aggressive or fin-nipping species.

Why Buy From N8 Aquatics

• Carefully raised aquarium fish
• Healthy, well-conditioned stock
• Strong genetics and vibrant colouration
• Breeder support if you have questions

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.