If the pond water is black due to excessive fertilization, the first step is to stop fertilizing. This black water is characterized by more bubbles, while the bottom is relatively small, Goniostomum and Cryptomonas in the pond have become the dominant algae species, because of their strong adaptability, and the water light requirements are not high, so it is not easy to deal with.
As mentioned above, black water is mainly part of the algae become dominant algae, if you can cultivate other algae, can also play a role in improving water quality. Usually, probiotics should be supplemented regularly, and the decomposition ability of organic matter in water should be strengthened to promote the growth and reproduction of beneficial algae, so that the water quality can be gradually clear.
In addition to stopping fertilization and supplementing probiotics, the algae in the tank can also be eliminated by putting drugs. Commonly used drugs are bacteriotoxin disinfection, which can be put into about 300-500 grams per mu, and at the same time, solid oxygen tablets should be put in at night, or granular oxygen should be used to increase oxygen, so as to prevent and control hypoxia at night, and then detoxify with clear water the next day.
If it is an old pond, the blackening of the water may be due to the fact that the bottom mud has not been cleaned for a long time, resulting in the breeding of a large number of harmful bacteria. In this case, the pond needs to be thoroughly cleaned. First, the water in the pond is dried, and then the bottom mud is removed. Generally, the bottom mud should be cleaned to be consistent with the color of the surrounding soil, so that quicklime can be spread to disinfect it.
