I bought 6 koi fish and raised them for a week, and the fish began to have white spots and festered

You are not too specific so you can't be too sure about the situation in your tank There are many factors for fish to get sick According to your current description, it is estimated that it is more likely to be a head hole or rotten gills This should belong to ectoparasitic infection It has little to do with water temperature It may be the reason why your water raising process is not sufficient and the water quality is bad It is also possible that the fish carries germs when you buy it and is not in good condition Now it is recommended to isolate the sick fish immediately Medicine (domestic cheaper ones have Huihong's etc** are not expensive.) Generally, ornamental fish are bought in fish markets) with salt (do not use edible salt!! Use coarse salt! The kind of big grain!

In addition, it is very important to strengthen the filtration of the fish tank to ensure that the water quality is good, and only in this way can you ensure that you can raise a tank of healthy and healthy fish, which is not easy to get sick, and beautiful!

Spring and autumn days are easy to occur, can be diluted with potassium permanganate, pay attention not to be too thick and red, soak the fish for 30 minutes - 1 hour to fish out for normal management, serious can be soaked several times, usually bask in the sun, change the water frequently, change the water to be fully dried and the water temperature is consistent.

It's too hot or oxygen-deprived, don't bask in the sun all the time, just put some salt.

Raise the water temperature to 32 degrees Celsius and then continue the medication.

Your fish is sick, you grind oxytetracycline into powder, sprinkle it in the water, and the fish will be fine.

Do you change the water frequently? Also, the tap water you change for the fish can't be put directly into the fish tank, you have to prepare it in advance, let it sit indoors for two or three days to volatilize the chlorine in the tap water before putting it in the fish tank.

First of all, you are not a koi, this is a grass goldfish. Second, the white piece on the head was actually injured by the fish hitting the wall and corner of the tank. This situation is often encountered among aquarists.

Caojin is a relatively lively ornamental fish, and when encountering such a thing, it is necessary to keep the water clean and prevent dirty water infection. It will return to normal in about half a month.

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