Why do my 3 buenos aires tetras keep chasing each other?

Buenos Aires tetras are a schooling fish species, and it's natural for them to chase each other as part of their social interactions and establishing dominance within the hierarchy of the school. The chasing behavior could also be a mating ritual or a territorial dispute, as these tetras are territorial and may display aggression toward each other to defend their perceived territory.

To reduce chasing behavior, ensure that:

1. Adequate space: Provide them with enough swimming space in the tank to avoid crowding and ensure each fish has enough room to move freely.

2. Balanced male-to-female ratio: In small groups, there may be an imbalance in the sex ratio, leading to increased chasing as the males compete for the attention of the females. Aim for a ratio of 1 male to 2-3 females.

3. Adequate hiding spots: Buenos Aires tetras appreciate having hiding places such as plants or driftwood to retreat to when they feel threatened or need a break from social interactions.

4. Proper feeding schedule: Provide a balanced and nutritious diet to ensure the tetras are healthy and well-nourished. Overfeeding can contribute to aggression, so follow the recommended feeding guidelines.

If the chasing persists despite these measures, consider rearranging the tank decor to provide more visual barriers and territories for the tetras. Additionally, adding more compatible fish species that have similar temperament and size can help to distract the tetras and reduce the focus on chasing each other.