How did the goldfish die suddenly? What is the reason?

This is because of the water quality. If the water quality is alkaline and the calcium content in the water is high, it is easy to cause eye diseases of goldfish, similar to cataracts.

If goldfish rub against each other or the water quality deteriorates, it will lead to infection and goldfish will die. High chlorine content in water can also cause this situation. When changing water, it is suggested to keep one-third of old water and two-thirds of new water, instead of using newly released natural water. You should get some sunshine for a day or two.

Generally, there are two situations:

1, cataract with white spots on the eyes, which belongs to vitamin A deficiency, poor feed and nutritional deficiency. At first, I could see eating, but then I couldn't see it as it became more and more serious. Vitamin a supplementation will relieve it.

2. There is a white film outside the eyes, which is obvious. It belongs to bacterial infection, and some people call it blindfolding. Poor water quality, harmful bacteria exceeding the standard, medicated bath disinfection. If there are snails in the fish tank, there may also be parasitic complications.