I had a fish pond till about 3 months ago when my 5 goldfish suddenly died.
I have a fountain over the top and it was lovely -no idea why they died however i drained the water and it was putrid on the bottom as it is a cemented pond, and now i need a handyman to clean and repaint it.
I don't think i will put fish in again though as they make it so dirty and you cannot clean it even though I have a filter.