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How to remove green algae from water filters? Ornamental fish breeding---Although it does not cost much to buy a set of bottom filter (also known as sand layer filter, bottom wave plate and bottom plate filter,It is effective and does not require special maintenance.But,If anything goes wrong,The consequences are unimaginable.When this filter was launched in China since 1988,Aquarium enthusiasts just blindly follow the ads,I don't know anything about its operation principle.After a period of use,Problems continue to arise,And then made another water pollution to it,Evaluation of indirect death of fish.Actually,The reason for this adverse consequence is due to the fact that most aquarium enthusiasts do not know much about the operational skills and practical value of the underlying filtering.The main function of underlying filtering is to provide biological filtering efficiency.In nature,Whether in the ocean or in the lake,There are two kinds of nitrogen-free bacteria that are used as biolog