Not good. The fish pond water turns green mainly because of the rapid growth of algae. The nutrients of algae are not nitrate, but phosphate and nitrogen. Organic matter in fish ponds, such as sludge, fish food, feces, deciduous weeds, etc., may increase the phosphate content in water, while nitrogen exists in ponds. Therefore, it is necessary to use algaecide.

Using algaecide to remove algae is better than unilateral algaecide, but using algaecide is harmful to fish and grass plants in the pond, so it is not recommended. It has strong sterilization and algae killing ability in general water quality, can effectively reduce algae reproduction, make algae irreversibly inhibit growth, and has high efficiency, no residue and low cost.

Chlorella lives in fresh water. With the help of sunlight, water and carbon dioxide, it divides into four cells every 20 hours, constantly converting solar energy into algae containing various nutrients, and releasing a large amount of oxygen in value-added, and its photosynthetic capacity is more than 10 times higher than that of other plants.

Strengthening the salinity control of fish pond water quality (pay attention to not putting salt in fish ponds) has a good effect on eliminating the phenomenon of green water. Usually pay attention to regularly check the salinity of fish pond water, and add or mediate it in time to keep the salinity of fish pond water at a certain temperature.