The reasons why arowana cannot be raised in pairs:

1. Fierce temperament. Because arowana is a fish with a fierce temperament and a strong sense of territory, when the owner keeps two arowanas together, they are prone to fights.

2. Large size. Arowana is a large fish that can grow to 80-100cm. When two arowanas interfere with each other's activity space, it will cause slow development of the arowana and curvature of the spine, which is not conducive to the growth of the arowana.

3. Expensive. Arowana is different from other common varieties. Its price is much more expensive than other fish varieties, and it is not affordable for ordinary people. Families with similar financial conditions can afford an arowana, which is already very good.

4. It has a moral meaning. Arowana has the character dragon. In folklore, dragon means emperor, and there can only be one emperor. Raising two arowanas means there are two emperors, which is against the rules, so people often choose to keep only one arowana.

Notes on raising arowana:

1. Sufficient space. Arowanas are large in size, and breeders need to ensure that they have sufficient living space during the breeding process, so that the arowanas can grow and develop better.

2. Feed properly. The feeding frequency of Arowana is also different at different stages and under different water temperatures. Breeders need to decide the feeding frequency based on their actual situation and eating status.