Do bettas need a heater?

Yes, bettas need a heater. Betta fish are native to Southeast Asia, which means they need warm water to maintain a healthy appetite and metabolism. Bettas thrive best at 75–80 degrees Fahrenheit (23.5–26.5 degrees Celsius). In order to maintain these temperatures, you’ll need an adjustable heater.

Make sure to check the water temperature regularly. If the water is too cold, your betta fish might exhibit signs that they are unwell:

  • Lethargy and slow swimming
  • A lot of time spent resting at the bottom of the tank
  • Unnatural responses to stimuli, such as food and toys
  • Frequent sickness

If the water is too warm, you might notice these signs:

  • Rapid breathing
  • Unnaturally erratic swimming
  • A lot of time spent at the surface