Đào ao ở vị trí có bóng râm để hạn chế ánh nắng mặt trời. Xây bờ để ngăn nước mới chảy vào ao. Dùng thuốc nhuộm ao để hạn chế lượng ánh sáng mặt trời được nước hấp thụ.

I'm interested in that, but I only have a few mins. Can you give me at most the first 500 characters of a detailed explanation in English about that?
Algae needs sunlight to grow, so if you’re still in the planning stages of a new pond, consider installing it in an area that only gets a little sun. Try building a pond near a tall wall, or use a shade mat or sail to stop algae from being able to grow.  You shouldn’t rely on shade that comes from large trees, as they may drop leaves into the pond. Fallen leaves will eventually rot and let algae grow, meaning you’ll need to clean your pond more often. Shade mats and sails are custom-made barrier