When keeping betta fish, the choice of fish tank size should comprehensively consider breed characteristics, swimming space, and water quality stability. Below are specific recommendations:
1. Basic Size Requirements
Minimum Size
Single Thai Betta: A minimum size of 15×15×15cm (approximately 3.5 liters of water) is recommended, though a water volume of over 1 liter can meet basic survival needs.
Chinese Betta: Due to their larger size, a 20×20×25cm tank (about 10 liters of water) is recommended.
Ideal Size
General Recommendation: A square tank of 20-40cm (5-19 liters of water) is preferred, with a 30cm ultra-clear glass tank being the best choice, as it balances swimming space and water quality stability.
International Standard: A water volume of 5 gallons (approximately 19 liters) or more is ideal, as it facilitates the installation of heating and filtration equipment.
2. Breed Differences
Thai Betta: Hardy varieties such as Veiltail and Plakat require a water volume of over 300 milliliters, while sensitive varieties like Halfmoon and Crowntail are recommended to have a water volume of over 500 milliliters.
Group Keeping Requirements: If keeping Chinese Bettas in a group, a 60×60×60cm square tank can accommodate 20-30 fish.
3. Other Considerations
Filtration and Tank Cover: Small tanks need to be equipped with a low-flow filter, and a tank cover (preferably acrylic) should be used to prevent the fish from jumping out.
Breeding Tank: A space of 30-40×20-30×20-25cm is required, paired with dark-colored substrate.
Summary
Priority should be given to a square tank of 20cm or larger; a larger water volume is more beneficial to the health of betta fish.