Maintaining water quality is crucial for the health of your pond ecosystem. Regularly test the water for pH, ammonia, nitrite, and nitrate levels. Install a good-quality pond filter and pump to keep the water clean and clear. Remove debris like fallen leaves and excess plant matter to prevent nutrient buildup and algae growth. Consider adding beneficial aquatic plants that naturally filter the water and provide oxygen. Finally, perform partial water changes when necessary to refresh the pond's environment.