Cardinal Tetra (Paracheirodon axelrodi)

The Cardinal Tetra (Paracheirodon axelrodi) is one of the most vibrant, peaceful, and popular freshwater schooling fish in the aquarium hobby.

Key Requirements for Thriving Fish

Keep Large Schools: Always buy a group of at least 6 to 10 fish. Small groups cause them severe stress, which drains their vibrant colors and triggers illness.

Provide Tank Cover: Decorate with live plants, driftwood, and dried almond leaves. They love shaded spots and dim lighting, which mimics their wild jungle habitat.

Acclimate Slowly: Wild-caught Cardinals are highly sensitive to sudden changes in water chemistry. Drip acclimate them carefully when introducing them to your aquarium.

Choose Peaceful Tank Mates: House them with other calm, small species.

Excellent options include Discus, Corydoras catfish, small Rasboras, and dwarf cichlids. Avoid large or aggressive fish that can fit a tetra into their mouth.