White spot disease is because the water temperature is too low, the water temperature reaches 26 degrees, and the white spot disease naturally disappears. It is recommended to buy a small heating rod, which is available in the flower, bird, fish and insect markets. The small one is about 10. Nausea may be a symptom of your newly bought koi fish, so I suggest you observe it in isolation. In addition, when buying new fish in the future, don't put the water in your pocket into the fish tank. There are many fish in the water outside, the water quality is not good, and there will be many bacteria!