1. Identify the aggressor.
The aggressor may display the following behaviors:
* Chasing or nipping at the other fish
* Displaying flared gills or fins
* Circling the other fish
* Stealing the other fish's food
2. Remove all decorations and plants.
These can provide hiding places for the aggressor and make it difficult to catch.
3. Add aquarium salt to the tank.
This can help to heal the damaged fins and reduce stress.
4. Feed the fish a high-quality diet. A healthy diet can help to improve the fish's overall health and make them less likely to fight.
5. Observe the fish closely for signs of stress or injury.
If the fish are still fighting or if they show any signs of stress or injury, you may need to take them to a veterinarian for further treatment.
6. Increase the size of the tank. If you have multiple Siamese fighting fish, increasing the size of the tank can help to reduce stress and aggression.
7. Add more hiding places to the tank. This will give the fish a place to escape from the aggressor.
8. Monitor the fish closely. If you see any signs of aggression, remove the aggressor from the tank immediately.
9. Consider rehoming the aggressor. If the aggression continues, you may need to rehome the aggressor to prevent further harm to the other fish.