Step 3 – Add a Heater Bettas are tropical fish that prefer water temperatures between 76–82°F. A small, adjustable aquarium heater is essential to keep the water warm and consistent.

A betta fish's feeding habits will be based on the temperature of its environment. The tank water should be around 78 to 82 degrees Fahrenheit, according to Aquatic Veterinary Services.

However, if your little Betta fish is losing color, make sure you are cleaning the tank regularly, and have your tank at the correct temperature (75-80 degrees Fahrenheit) If it gets too cold ...