1. Mechanical injury: The internal organs were damaged mainly because the fish was frightened and suddenly hit the fish tank. Symptoms: fish can't swim normally, such as standing upside down, swimming sideways, lying at the bottom of the tank for a long time, etc. Treatment: The disease cannot be treated with drugs, and can only be recovered by quiet feeding, frequent water change, maintaining good water quality and increasing muscle metabolism, ensuring temperature, and stopping feeding and light.
2. Ascites: ascites swelling caused by overeating and indigestion. Furazolidone tablets, yeast tablets, gentamicin.
3. Imbalance of swim bladder: ensure the water temperature, change the water by half, raise the temperature by 32 degrees, add salt, inject oxygen, stop eating and stop lighting.
Remember not to feed, you won't starve to death. My fish stays hungry and is fed four or five times a day. Besides, don't feed small live fish, the kind with bacteria or parasites.