Help! Fish get black spot, will it die? The feeling of jumping up and down will kill you! what can I do?

According to the information you provided, this fish may have black spot disease. Black spot disease is a disease caused by water mold and mold, which usually occurs when fish are injured, such as scales falling off or skin injury. This disease will lead to the loss of appetite of sick fish and eventually death.

The following are some measures to treat and prevent black spot disease:

1. Improve water quality: Keep water clean and add appropriate filters to help improve water quality. Change the water regularly to ensure that the added water is similar to the original water quality.

2. Raise the water temperature: raising the water temperature can inhibit the growth of water mold. Raise the water temperature to 1-2 degrees Celsius higher than that of the fish tank, and then keep this temperature.

3. Drug therapy: Some drugs can be used to treat chloasma. For example, malachite green or methylene blue can be dissolved in water under proper water quality conditions, and then sick fish are soaked in it.

4. Ultraviolet irradiation: Using ultraviolet lamp to irradiate fish tank can effectively inhibit and eliminate water mold.

Please note that the treatment of chloasma requires patience and caution. In the process of treatment, we should closely observe the situation of fish and adjust the treatment plan in time. If your fish is seriously ill or life-threatening, it is recommended to consult a professional fish doctor immediately or go to the aquarium for help.