A koi pond should have a balance of both sun and shade to maintain a healthy environment. Around four to six hours of sunlight per day is ideal, as it supports the natural ecosystem, encourages plant growth, and helps beneficial bacteria thrive. However, too much direct sunlight can raise water temperatures to unsafe levels, reduce oxygen, and promote excessive algae growth, which makes water maintenance more difficult.
On the other hand, full shade can limit plant health and reduce the natural breakdown of waste. If your pond is located in a sunny area, providing shade through nearby trees, pergolas, or aquatic plants like water lilies can help regulate temperature and light exposure. The goal is to create a stable, comfortable habitat where koi can stay cool during hot weather while still benefiting from the natural advantages of sunlight.
