How to Breed Cardinal Tetras: A Step-by-Step Guide

  1. Preparation: Set up a separate 10-gallon breeding tank with soft, acidic water (pH 6.5–7.5, 5–10° dGH, 77–81°F). Use gentle filtration and add a spawning mop or fine mesh.
  2. Selecting the Pair: Choose a healthy male and a female with a plump belly.
  3. Conditioning: Feed live or frozen foods such as brine shrimp and bloodworms, and slightly raise the temperature to simulate the rainy season.
  4. Spawning: Introduce the pair. The male will chase the female, who deposits eggs among the mop while the male fertilizes them.
  5. Post-Spawning: Remove the adults to prevent them from eating the eggs. Eggs hatch in 24–48 hours.
  6. Fry Care: Feed infusoria or commercial fry food, then gradually introduce larger foods. Maintain clean water as the fry grow.