There's a Goldfish species named after Tom Baker? Wow ........I'm partial to the Tom Baker series. That said, I would love to see some pics of your pond. I agree with removing as much debris from the bottom as you can, and a net over from early fall to late spring will serve to prevent too many leaves from falling in during the leaf falling time of year.
My daughter worked with a person who had a sonic screwdriver, signed by Tom Baker.