1. Reason: Map fish may be competing for food by biting each other's scales. They are greedy and have a high demand for food. If they don't feed enough food, they will have conflicts over food. When they fight, they often attack each other's scales.

2. Solution: Breeders need to feed them regularly and quantitatively, so as to ensure that they have enough food and avoid indigestion. If conditions permit, it is best to follow a small number of feeding methods.

1. Reason: Map fish may also be fighting for territory by biting each other's scales. Their character is fierce and their territorial awareness is strong. If there is not enough space to keep them, they will bite each other.

2. Solution: Map fish are medium-sized fish, and they need a large activity space to grow normally. Breeders need to prepare a space larger than twice their size to ensure that they have enough living space.

1. Reason: Map fish bite each other scales and may be in estrus. Although they usually act lazily, their personality will become extremely irritable during estrus.

2. Solution: Breeders need to separate the fighting map fish first, and it is best to place a partition in the fish tank to let them know each other's existence. When they get used to it, put them together and let them mate.