What does it mean when betta fish flare?

Betta fish flaring is a display of aggression or excitement. When a betta fish flares, it will spread its fins and operculum (gill covers) to make itself look larger and more intimidating. This behavior is often seen when two male bettas are in close proximity to each other, or when a betta is threatened by another fish or object.

Flaring can also be a sign of excitement or anticipation. For example, a betta may flare when it sees food or when it is about to be released from its tank. In these cases, flaring is not a sign of aggression, but rather a way for the betta to express its excitement.

If you see your betta fish flaring, it is important to determine the cause of the behavior. If the flaring is due to aggression, it is important to separate the fish from any other fish that it may be aggressive towards. If the flaring is due to excitement or anticipation, there is no need to be concerned.