The water quality is bad. If the water quality of the fish tank is not good, the color of the peacock fish will become lighter and lighter. At this time, it is necessary to change the water in time, increase the light and maintain good water quality, and the color will be restored. Anchovies are small migratory fish that usually live in the open sea. Every year in late spring and early summer, they flock into the river and lay eggs at the fresh water entrance of the middle and lower reaches.