The minimum tank size for neon tetras depends on the purpose of keeping them and their quantity. Here are specific recommendations:
1. Single-species Keeping Scenario
Basic Requirements: At least 10 gallons (about 38 liters) in capacity, with a recommended size of 30×20×20 cm (length × width × height).
Space Optimization: If keeping 6 adult fish, the water volume must be ≥10 gallons to avoid overcrowding.
2. Breeding-specific Scenario
Breeding Tank: A smaller tank with 7-19 liters of water (approximately 30×20×20 cm) can be used, but it needs to be equipped with spawning substrates and shading devices.
Temporary Rearing for Fry: It is advisable to use a separate tank of the same or slightly larger volume to prevent them from being preyed on by adult fish.