Bettas are tropical fish and they need warm water to survive. The ideal water temperature for a Betta is between 75-80 degrees Fahrenheit.
If the water temperature is too cold, it can slow down their metabolism, making them more susceptible to illness and disease.
In addition, cold water can cause Bettas to become lethargic and lose their appetite.
To ensure that your Betta is healthy and comfortable, it is important to keep the water temperature in their tank within the ideal range. You can use a thermometer to monitor the water temperature and make adjustments as necessary.