1. Establish a perfect filtration system to eliminate ammonia and nitrate. Including strengthening physical filtration, filtering out food and feces as much as possible, and washing cotton regularly can reduce the chance of organic matter being decomposed into ammonia and phosphate by bacteria.
2, reduce or reduce the source of organic matter. Including reducing the feeding density of fish and reducing feeding. Change the water frequently.
3. The lighting should be appropriate. Chlorella will carry out strong photosynthesis and grow rapidly under strong light. In addition, if the illumination time is too long, green water will definitely break out. Especially if the fish pond is placed in direct sunlight.
Treatment method:
1. Use germicidal lamp: ultraviolet germicidal lamp can destroy biological DNA, sterilize and kill algae, and can be used to kill Chlorella in water. Generally speaking, the green water will disappear in about 3 days, and the slowest will not exceed 10 days.
2. Coagulant: It is not recommended to filter out phytoplankton by coagulation, which is harmful to fish.
3. Biological control: Use Daphnia to eat Chlorella, provided that there are no fish that eat Daphnia in the pool.
4. Salinity control: Chlorella is a narrow salinization organism, which is very sensitive to the increase of salinity, so adding salt to water is very helpful to eliminate green water.
5. Use algaecide: Although algaecide can be used, it is not recommended because it is a medicament and harmful to fish and grass.
6, inhibit growth: it can reduce light, reduce food intake, and strengthen water change, which is safer, but the disadvantage is that the time will be longer.