If a goldfish turns black, there are three possible reasons. One is that the water quality is too poor, the other is illness, and the third is enteritis caused by eating unclean food. Corresponding measures need to be taken for different reasons. If the water quality is too poor, you need to pay attention to changing the water and disinfecting with bleach or salt; if the main disease is scaly disease, you can use yellow powder to clean it; if you accidentally eat unclean food, you should pay attention to the health of the food you put in.

1. The water quality is too poor: Goldfish prefers cold water and has certain requirements for water quality and temperature. You should pay attention to changing the water regularly. If the water quality is poor, you can use floating powder and salt to sprinkle it in. Disinfect so the goldfish doesn't turn black.

2. Suffering from scaly disease: You need to fish out the goldfish, then put it in a basin alone, wash the body with yellow powder, and then soak it with 4% salt and 2% penicillin after a week to make the goldfish The blackened body returns to normal.

3. Eating unclean food: When the food is rotten, the goldfish may cause enteritis after eating it, and the body will turn black. It is necessary to stop feeding the previous food, and then change the water to maintain the water quality. Healthy, ensure food hygiene and safety in the future, and be careful that food does not expire.