1, it may be that your water is often below 25 degrees, and the water temperature difference is very large, the adult fish can tolerate a temperature difference of 5 degrees, the juvenile fish will be 2 degrees to change the water temperature should be measured with the water temperature, there is no big difference before changing.
2, not because your water is not good two is your feeding method is not appropriate
3, bought back, you can already check out the problem, there are white spots on the body is
4, a fish sick, immediately isolate, do not let the disease infected, and then completely change the water, wash the tank, the other goldfish in other containers, and then put the sick fish bath
white spot The disease is also known as melioidosis.
Ornamental fish are more common due to the parasitization of the small melon worm. Fish infection in the early stage, the chest, back, tail fins and body surface skin are white dotted distribution, this time the sick fish foraging activities as usual, a few days after the white dots all over the body, the fish lose the ability to move, often stagnant, floating on the water surface, slow swimming, lack of appetite, body thinning, the skin is accompanied by hemorrhagic dots, and sometimes swing around and around, and in the aquarium wall, grass, gravel, next to the side of the side of the body quickly swimming rubbing itchy, swimming and gradually lose balance. The course of the disease is generally 5 to 10 days. Infection speed is extremely fast, if the treatment is not timely, within a short period of time can cause a large number of deaths.
The suitable water temperature of small melon worm is 15～25℃. This disease occurs in early winter, late spring and rainy season, especially in the lack of light, low temperature, lack of live bait is easy to epidemic. When the water temperature rises to 28 ℃, the small melon worm will begin to die.