Betta fish, also known as Japanese fighting fish, prefer regular periods of light and darkness. This ensures that the fish have a normal sleeping pattern.
Bettas originate from the Tropics of Thailand where there is an abundance of sunlight. Light lets the fish know when the day has begun, causing them to wake up. When it becomes dark, betta fish sleep. Bettas living in captivity need a light source to regulate their sleeping patterns, which helps to create a stress-free environment. Installing a light in the tank helps to regulate their schedule, which reduces stress on the fish and allows them to live longer.