I just bought a house, and one of the things that came with it is a fairly nice thousand gallon pond in the backyard. The house and pond have been neglected for over a couple of years. The filter pump went out about a year or so and the water looks like green soup. I was considering ripping it all out and planting bushes, but I found about eight goldfish in that water that have somehow survived in that mess. I've changed my mind, and I am going to try to restore it. Looks like I have a project.