Regarding betta fish as tropical species, their suitable water temperature range and related maintenance points are as follows:
I. Core Temperature Range
Optimal Active Water Temperature
24–28°C (applicable to both Chinese bettas and Siamese bettas). Within this range, they show vigorous metabolism, bright body colors, and strong immunity.
Critical Thresholds
- Low-temperature warning: Chinese bettas can tolerate 6–12°C, while Siamese bettas should not be lower than 18°C.
- High-temperature danger: Exceeding 30°C causes rapid breathing, and temperatures above 35°C may be fatal.
II. Varietal Differences
- Chinese betta: 24–28°C, can tolerate short-term low temperatures of 6°C.
- Siamese betta: 22–24°C, prone to illness below 20°C.
III. Seasonal Management Suggestions
Winter
Use a heater to maintain water temperature ≥18°C. Prolonged exposure to temperatures below 15°C may lead to dormancy.
Summer
Avoid direct sunlight. When water temperature exceeds 30°C, take cooling measures.
Water Change Notes
The temperature difference between new and old water should be controlled within 2°C.
IV. Special Needs
Breeding Period
It is recommended to fine-tune the temperature to 26–27°C to improve success rates.
Fry Stage
Strictly maintain a constant temperature of 26°C with a temperature difference ≤1°C to prevent deformities.
(Note: All data applies to adult, healthy individuals. Sick or weak fish require a 1–2°C higher temperature for maintenance.)