The temperature should be kept at 75-80 degrees Fahrenheit. Colder water can kill the betta, as the betta's immune system will slow and make them susceptible to disease. Hotter water can make them uncomfortable and age quickly, as their metabolism will increase. The temperature should be maintained with a heater.

Do bettas like warm water?

Many betta owners are not aware that their betta requires warm water, not just the room temperature water that ranges from 68–72 degrees Fahrenheit (21–23 degrees Celcius). Ideally, the water should be between 78–80 degrees Fahrenheit (25.5–26.5 degrees Celcius) for a betta.

Do bettas prefer warm or cold water?

In the wild, betta fish live in tropical areas. So when you keep bettas in an aquarium at home, they'll still need the warm water habitat that they're used to. In fact, they have a pretty narrow ideal temperature range – the most optimal being 78-80º F (s25. 5-26.5º C).