If black moss grows in koi pond, it needs to be fished out and cleaned immediately. The propagation speed of moss is relatively fast. As long as the light is sufficient, they will soon occupy the water body, which will not only affect the space for fish to move, but also consume oxygen, which is harmful to the health of koi fish. Therefore, it is necessary to eliminate it after discovery. At ordinary times, it is necessary to control the illumination time, reduce the feeding of food and prevent the outbreak of algae.

1. Occupy space: The growth of moss will occupy a certain space, so that the activity area of koi fish will be reduced and the growth of many plants and algae will be limited. In view of this situation, the best way is to clean up some of them. Of course, if you have the ability, it is also possible to clean up all of them.

2. Oxygen consumption: Moss, as a plant, can carry out photosynthesis, but it also consumes oxygen in water. At night, because it can't release oxygen, it only consumes oxygen, so fish in fish ponds are easy to float in the morning, which has certain influence on their breathing.

3. Twisting fish: If the moss propagates to a certain amount, it will pose a threat to the survival of fish. Koi may be entangled by it when swimming, and will be fixed in one place for a long time, and will starve to death after a long time.