Green water/algae caused by over feeding and fish waste is unsightly in an aquarium, and can be dangerous as it may alter the pH and oxygen levels. Algae Gone is a single-dose, plant-friendly treatment that will clarify the green or cloudy water in your aquarium. It works by clumping the minute particles together enabling your filter to strain them out. Use when the water in your aquarium has become green or cloudy. Algae Gone will also help to lower algae-causing phosphate, thereby promoting a healthier aquatic environment.