Dedicated koi pond
Best for serious koi keeping. It prioritizes depth, clean walls, bottom drains, strong filtration, oxygen, and easy netting. Plants and rock-filled bottoms are usually minimized because they trap waste and complicate health management.
Garden pond with koi
Balances fish and landscape. It may include shelves, plants, rocks, and waterfalls. It can work, but stocking should be conservative and maintenance must account for debris trapped around plants and stones.
Raised koi pond
Good for small yards and easier viewing. Raised walls can reduce digging and make equipment access cleaner. Temperature swings and structural strength need attention.
Naturalistic pond
Looks informal and wildlife-friendly, often with plants and soft edges. For koi, this design needs careful filtration and predator protection because naturalistic does not mean self-cleaning.
Quarantine or hospital tank
A separate temporary system for new or sick fish. It should have aeration, cover, filtration, dechlorinated water, and stable temperature. This is health equipment, not an optional luxury.