How is the tail of the ornamental fish white shark bruised and festered?

Infection and water mold caused by poor water quality should be treated immediately with the old three samples.

Change the water 1/3, keep the temperature constant when the original salt under the water is 0.3%, then change the water 1/5 every day for at least one week, and pay attention to supplementing salt after changing the water. After a week, there will be obvious improvement and the water quality will continue to be maintained.