Hiya guys I'm new to the hobby and recently just built my first pond and within the space of 3 weeks it turned green is there anything I could add to get rid of the algy Uv filter is a game changer shade if you can and in time a extra filter or bigger i have done 2 ponds and both times i have under estimated the filtration pond 3 coming soon so planning better than I think i need Pump,filter,uv light, air pump .