1. Reason: The rotten tail of Arowana may be caused by poor water quality, and they have higher requirements for water quality. If there are many impurities in the water, they will have unfinished tails.

2. Treatment: Breeders need to change water immediately to keep the water clean. Also use sterilization drugs to clean the filter materials to avoid bacteria breeding.

1. Reason: The rotten tail of Arowana may be caused by the lack of timely treatment after trauma. Although they are large in size, their tails are fragile and they are prone to injury. Once the wound worsens, infection will occur.

2. Treatment: The breeder needs to clean up the rotten parts first, and then give the sick fish a medicinal bath with potassium permanganate solution. Take a medicated bath once a day for 15 minutes each time, and you can recover after sticking to it for one week.

1. Reason: Silver Arowana's tail is rotten, which may also be suffering from rotten tail disease, mainly due to bacterial infection. For example, if food residue is always in water, it will lead to rapid growth of bacteria.

2. Treatment: Breeders need to isolate them immediately to avoid infecting other fish. Also use furazolidone or oxytetracycline to give them medicated bath, insist on medicated bath for one week, and the unfinished tail can be cured.