The reasons why parrot fish have rotten fins and tails:

1. The water quality is too poor. If the water quality in the fish tank is too turbid, the water has not been changed for a long time, and the filtration system in the tank has not been cleaned in time, and a large number of bacteria remain in the water, and the parrot fish lives in a turbid water environment for a long time, the parrot fish will easily develop fin and tail rot. situation.

2. Trauma. When a parrot fish fights with its own kind, and the fins are damaged, the bacteria remaining in the water will cause the wound to become infected, leading to tail and fin rot.

3. High stocking density. If the space in the fish tank is small, there are many fish, and the internal oxygen content is low, parrot fish are prone to fin rot.

4. The water temperature is too low. Fin rot in parrot fish may also be caused by the temperature being too low, because when the temperature is too low, many bacteria will breed quickly, causing infection in their fins.

Treatment methods for fin and tail rot in parrot fish:

1. Isolate and change water: After symptoms are discovered, isolate the sick fish as soon as possible. At the same time, the water in the original tank should be replaced to prevent other fish from being infected. If you are worried, you can add some coarse salt to the tank to sterilize it.

2. Disinfection of sick fish: After isolation, attention should be paid to disinfecting the sick fish. You can put some coarse salt, yellow powder and other drugs in the tank for sterilization. If the symptoms are not serious, the sick fish can slowly recover after disinfection.

3. Pay attention to raising the temperature: If tail rot and fin rot are caused by white spot disease, the breeder should pay attention to raising the water temperature and control the water temperature at about 30 degrees. This can effectively kill parasites in the water and help with recovery.

4. Drug treatment: If the condition is serious, it can be treated with medicinal bath. Add a trace amount of mercury nitrate or malachite green solution to the water to soak the sick fish once a day for half an hour. If this persists for a week, the sick fish can recover. Food feeding should be suspended during treatment to avoid adverse reactions.