My friend's daughter loves gardening and she has a beautiful pond in their backyard with water trickling down this little rocky cascade. It's so restful.
And full of happy goldfish! It is well established, and she had read and read about it before doing it. She says she feeds them until October or so when it gets cold and then they hibernate for the winter in there, and in the spring she begins to feed them again. Over the winter, they have breeded and multiplied.
This is the way to have goldfish! In the spring, she said there are also lots of tadpoles and when they become frogs, they are off and hopping and she doesn't see them again. Just hears them somewhere off in the distance.