If there is white membrane in fish eyes, it will be contagious. This disease is also called blindfolding disease, which is caused by many reasons, such as fighting injury, which leads to bacterial invasion, too many changes when changing water, which leads to fish being stimulated by new water, or too much temperature difference between day and night, which also leads to fish blindfolding. If you want to treat it, you should pay attention to changing water and adding salt properly, and use penicillin and other drugs to soak and wash it.

1. Fighting injuries: Fish can easily hurt their eyes when fighting. Once their eyes are injured, they can easily suffer from blindfolding. In the daily feeding process, we must avoid fish fighting. If some fish are aggressive and aggressive, it is best to raise them alone. If they are mixed, there should be enough space so that the fish can escape when fighting.

2. Stimulation of changing water: Pay attention to the amount of water when changing water at ordinary times. If you change water too much or too frequently, the new water will stimulate the fish and cause a long white film on the eyes. Usually, it is enough to change the water once a week, and the amount of water changed each time should be controlled at about one quarter, and no more than one third at most.

3, the temperature difference is too large: As a temperature-changing animal, fish has limited adaptability to temperature, and if the temperature difference is too large, it will also lead to blindfolding. Therefore, we should pay attention to temperature control, keep the temperature constant, and the temperature difference in one day should be controlled within 2 ℃.