The leaves of aquatic plants will turn black. Is it moss?

Sometimes the leaves of aquatic plants turn black, which may be due to the following factors:

1. Changes in water quality. When changing water, whether there is too much water and whether the water quality changes suddenly, the leaves will turn black.

2. The light is too strong. If the light is too strong and the wavelength of the light is not suitable, the leaves will turn black.

3. The discomfort of growth conditions, such as too high temperature, improper fertilization, whether to add carbon dioxide, etc., will affect growth.