Algae Gone 250mlSuitable for coldwater & tropical aquariums clumps algae and other particles together allowing filter to strain them out.Green water/algae or cloudy water caused by over feeding and fish waste is unsightly and can be dangerous as it may alter the pH and oxygen levels in your aquarium. 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. To prevent algae growth recurring use NT Labs Phosphate Remover.