1. To quickly remove duckweed, you can spray Nanda herbicide or No-Till water-soluble granules into the water. This type of agent is highly efficient and low-toxic. It may affect fish after spraying, so this method is not recommended.

2. If you want to remove duckweed from the water healthily, you can raise some duckweed-eating fish in the water. Although duckweed is a harmful plant to some extent, it is an excellent green fodder for some fish. Fish that grow up eating duckweed are rarely infected with hepatobiliary syndrome. When removing duckweed, you can also uproot the duckweed directly from the water. This method has the fastest effect and will not affect the growth of the fish.