Fountain Cleaner I Have A Small Pond (5x5...20"deep) With A Fountain. I Want To Place Goldfish In It. Will They Help?

I have a small pond (5x5...20"deep) with a fountain. I want to place goldfish in it. Will they help? - fountain cleaner

I need help to keep my small pond and a clean source. Someone suggested that the goldfish. They help keep it clean and I will clean up after them, and the small pond with a fountain? Someone has to bury her goldfish to your source? Before you go and buy gold fish and put them in my small pond ... I would like some advice. Anyone?