My water is green!?

Green water is a symptom of nutrient overload in an aquarium, and usually result when nitrates and phosphates from fish waste build up, combined with some strong illumination, such as sunlight from a window. Regular water changes and proper feeding techniques, combined with appropriate stocking levels in the aquarium will prevent this common problem. If the problem persists, there are many products available to help kill the algae, and remove the nutrients.