Are Betta Fish Nocturnal? (Sleeping Behaviour)

No, Betta Fish are not Nocturnal. They are diurnal, which means they are most active during the day and tend to rest or sleep at night. Nocturnal animals are primarily active during the night, while diurnal animals, on the other hand, are most active during twilight periods, such as dawn and dusk.

Whereas betta is actively swimming, foraging for finds, and interacting with their surroundings during daylight hours.

As the day begins, bettas gradually awaken from their sleep and become more active. They may swim around their aquarium, explore their environment, and display to assert dominance or attract potential mates.

During the midday hours, bettas may exhibit a slight decrease in activity. They may find a comfortable spot in their tank, rest on leaves or decorations, and take short periods of rest.

As darkness falls, bettas naturally wind down and prepare for rest. They may find a comfortable spot to rest, often near the bottom or in plants, and reduce their activity levels. It's crucial to provide a dark and peaceful environment denying the night to allow them to have uninterrupted sleep.

How can I know if my Betta fish is nocturnal or diurnal? 

If your bettas fish is active and displays vibrant colors during the day, but becomes less active and duller in color during the night, it is likely diurnal rather than nocturnal.

Following are a few indicators that can help you assess its activity patterns:-

  • Daytime activity: pay attention to your betta's behavior during daylight hours. If it regularly swims, explores its environment, or eagerly interacts with you during the day it's likely more diurnal than nocturnal.
  • Sleep patterns: Bettas like other fish, do sleep. They tend to be less active and may rest near the bottom of the tank or find a quiet spot to rest. Observe your betta during the night and early morning hours to see if it remains relatively inactive or exhibits sleep-like behavior.

Can Betta Fish see in the dark?

While Betta Fish have relatively good eyesight, they cannot see in complete darkness. Betta fish, also known as Siamese fighting fish, have a good ability to see in low-light conditions, but they are not specifically adapted to see in complete darkness. Like many other fish, bettas have specialized cells called rods and cones in their eyes that allow them to perceive light and distinguish different colors. The rods are responsible for vision in dim light, while the cones are responsible for color vision in bright conditions.

Should I provide a light source for my Betta Fish at night?

It is not necessary to provide a light source for your Betta fish at night. Bettas need a period of darkness to rest and maintain a healthy sleep cycle. Providing a completely dark environment at night is beneficial for their overall well-being.
Nocturnal animals are primarily active during the night, while diurnal animals, on the other hand, are most active during twilight periods, such as dawn and dusk. Whereas bettas actively swim, forage for food, and interact with their surroundings during daylight hours.

Betta fish, like many other fish, benefit from having a regular day-night cycle that mimics their natural environment. While they don't require a bright light source, during the night, it is generally recommended to provide a low-level ambient light or dim lighting during the evening hours.

The following are reasons why providing some form of light at night can be beneficial:

Stress reduction, sudden and complete darkness at night can potentially stress out Betta fish. Having a gentle, low-level light source in the tank helps them feel more secure and relaxed.

If you want to observe your Betta Fish during the night, providing a dim light source can help you see their behavior without disturbing their sleep too much. It's essential to keep light and non-intrusive to avoid causing stress to the fish.