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Just go to the fish shop to buy medicine (tell him it's white spot medicine)

However, if there are black goldfish, it is easier to die. I think so, too. How to keep them for no more than a month? . . Sometimes they starve to death, sometimes they die of lack of oxygen, and sometimes they die. . . .

Second, fish farming, you can buy some aquatic plants with small leaves as green vegetables (leaves are too big to eat) and put them underwater for ordinary aquatic plants.

If you eat, you can also go to the fish shop to buy some red worms as meat, and you should refrigerate them when you buy them. Do not eat. . . .

Third, it is best not to let the fish get sunburned. They don't like it.

Fourth, the water temperature should not drop to 15 degrees. If the weather is too cold, you need to heat the pipe.

5. If the water is changed too much, take some tap water and let it stand for about 6 hours, and then add it after changing it with that water. Change the water less, so you don't have to bother. My family just put the water to be changed in a 5-liter Watsons tank. . . .