Rotten fin and rotten tail: diseases caused by bacteria and mold in wounds.
1. It may be that fish bite each other and cause bacterial infection.
2. It is mostly due to poor water intake, long-term turbidity of water quality and excessive stimulation of new water.
Symptoms: the fish fin turns white, the wound secretes mucus, and the caudal fin, dorsal fin and ventral fin may rot, resulting in blood spots. When the disease gets worse, the rotten fins and tails will be separated from the fish, which will lead to death in severe cases.
Water quality problem! Buy some medicine for rotten tail. Change some water and put some salt every day to kill the virus. Otherwise, germs will spread quickly. It may be caused by dirty things and foreign water! I hope the fish will recover soon. Hope to adopt! thank you