Is it normal for Oscar fish to fight?

Yes, it is normal for Oscar fish (Astronotus ocellatus) to fight. These large and territorial cichlids are known to be aggressive towards each other, especially when they are competing for food, mates, or territory. Fights between Oscars can involve chasing, biting, and ramming, and can sometimes lead to serious injuries or even death.

To avoid aggression and ensure the safety of your Oscars, it is important to provide them with a suitably large tank, with plenty of space to swim and establish territories. It is also essential to provide them with a balanced diet and to ensure that all of their needs are being met. Additionally, keeping a group of Oscars together rather than a single pair can help to distribute aggression and reduce the likelihood of fights.