1. White spot disease: fish gills or skin on the surface of a small white punctate cysts, serious when the whole body is small white spots.
2. Rot: Rot begins at the end of the tail, then spreads to the base of the tail, and in severe cases can rot other fins.
3. Needle tail disease: Diseased fish will be restless, fin tightening, swimming when the body is not coordinated.
Most of the reasons why fish get sick are the deterioration of their living environment, which reduces their immunity, thus allowing bacteria to take advantage of it. Therefore, in the process of disease prevention and control, we should not only prevent bacteria and viruses, but also ensure that the living environment of fish meets the standards. In the aspect of anti-bacteria and anti-virus, salt can be added to water to achieve the effect of sterilization and disinfection. If the fish has a wound, it should be treated in time, otherwise it will be infected with bacteria and cause illness.
Environmental conditions are mainly from two aspects of water quality and temperature. The water quality should be adjusted to the acidity and alkalinity that fish like, and the water quality should be clean. The oxygen content in the water should be sufficient. Water quality mutation should be avoided every time water is changed. The temperature should be controlled in the range of 21 ℃ ~ 29 ℃. And maintain stability to enhance their immunity. When changing water, the temperature difference between new water and old water should not exceed 2 degrees Celsius.