So I have two small ponds in the back garden: I really do not want to install power sockets, which means no filters/pumps etc. Is it possible to keep these two small ponds clean and enjoyable? I asked a local nursery and they said I can throw in a lot of oxygenator plants. Then add a few fish to keep mosquito larvas in check. Is it that simple? Has anyone tried to keep a filterless small pond with success? And advices will be appreciated.