I am considering building a pond and have worked out some specific measurements for it. It will be 10 X 10 square-shaped, 3 ft deep and will hold about 2000 gallons. Can you tell me if this would be adequate space for about 20-30 goldfish (pond comets and sarasa comets) and a few koi? Also, who would you recommend as a reputable company from which to purchase filters and pumps?
Any advice will be greatly appreciated.

Thanks,
Lindsay