Unhappy. There are too many algae in green water, which has a serious impact on the growth of zebrafish fry. A large number of algae need to consume a lot of oxygen, which will lead to hypoxia in fish tanks and slow down the growth of zebrafish fry. Moreover, excessive algae are more likely to lead to the deterioration of the water environment and destroy the living environment of zebrafish, which is fatal to zebrafish, so it is unpleasant to grow.