1. Reason: The rotten tail of Arowana may be caused by poor water quality, because Arowana has high requirements for water quality and is sensitive to the fluctuation of water quality. If the water quality of feeding is too poor, it will lead to unfinished tail.

2. Treatment: Breeders need to change water immediately to keep the water clean. Also clean up the food residue and feces in the fish tank to avoid the deterioration of water quality. Also clean the filter to avoid bacteria breeding.

1. Reason: The unfinished tail of Arowana may be caused by bacterial infection due to lack of timely treatment after trauma. Their character is fierce, but their tail is fragile. Once there is a fight, their tails will be injured.

2. Treatment: The breeder needs to isolate the injured arowana, and add some coarse salt to their isolated fish tank to avoid more serious wound decay. If the unfinished tail is serious, it is necessary to smear some potassium permanganate on them.

1. Reason: The rotten tail of arowana may also be bacterial rotten tail, which is mainly caused by carrying a large number of bacteria in water or fed food.

2. Treatment: Breeders need to use anti-inflammatory drugs or antibiotics to give them a medicated bath once a day for 20 minutes each time. Stick to it for one week, and the unfinished situation will be cured.