Bacterial infection and external parasitic infection, let’s get rid of the parasites first. This kind of white spots is melonworm disease, which has a rapid onset and can infect fish gills and cause suffocation and death. Fish are directly infected with each other, or Caused by a sudden drop in water temperature, the treatment is very simple. Use white spot net, trichlorfon, and other fish medicines.

As for bacterial infection, red carp have very good resistance. It means that the infection has reached this level. The water environment is already very bad, and the poster actually put iodine-containing table salt, which will poison the fish if not rotten to death

Now tell the poster what to do:

Jiayule Take the dried water that has been dechlorinated, replace more than half of the water in the tank, replace the filter cotton with a new one, turn on the oxygen, do not put salt in the water, not even large amounts of salt, let alone edible salt! Use sterilization and insecticides. Special sterilization and trichlorfon are recommended. If you can't buy them, penicillin, white spot net, and yellow powder are all acceptable. Keep the water temperature at 10 to 15 degrees, and replace one third of it after three days. Water, another dose