Whether a betta fish needs a heater depends on the ambient temperature and the stability of the water temperature. Here's a detailed analysis:
I. The Necessity of a Heater
Temperature Requirements
Both Siamese fighting fish (Betta splendens) and Chinese fighting fish are tropical fish, with an optimal water temperature range of 24-28°C. If the ambient temperature is consistently below 22°C for a long time (such as in winter or when there are large day-night temperature differences), a heater must be used to maintain a constant temperature. Otherwise, problems like enteritis and weakened immunity are likely to occur.
Breeding and Juvenile Fish Care
During the breeding period, the water temperature needs to be raised to 26-28°C to increase the hatching rate. Juvenile fish require a constant temperature environment of 26°C ± 1°C; a temperature difference exceeding 1°C may lead to spinal deformities. In such cases, a heater combined with a temperature alarm is an essential piece of equipment.
Special Cases
High temperatures in summer: If the water temperature exceeds 30°C, physical cooling methods (such as ice packs or fans) are needed, and heating is unnecessary at this time.
Short-term temperature fluctuations: If the indoor temperature is stably above 24°C without drastic changes, the heater can be temporarily not used.
II. Recommendations for Choosing and Using a Heater
Equipment Recommendations
Choose a heating rod with moderate power (such as 50W), and pair it with a thermostat or alarm for precise temperature control.
Usage Notes
Avoid placing the heater directly in sunlight or near cold air sources to prevent excessive temperature differences.
When changing water, adjust the temperature of the new water in advance to avoid sudden changes.
III. Summary
Scenarios where a heater must be used:
The ambient temperature is consistently below 22°C;
During the breeding period or the juvenile fish care stage;
There are large indoor temperature fluctuations (such as a day-night temperature difference exceeding 5°C in spring and autumn).
Scenarios where a heater can be temporarily not used:
The water temperature is stably below 28°C in summer without extreme high temperatures;
The indoor constant temperature environment is maintained at 24-26°C all year round.