Hi all, Very quick one. Could any one tell me the reasons for green spot algae? Another one is hair algae, the type thats really quite slimy and looks very soft and almost cloudy when it gathers in big areas. And the last is a tough, almost pubic hair ( sorry if your having your breakfast ) type, deep green algae, often found at the base of rosette plants etc. I don't get algae in my tanks, but im curious as to why these type are common occurrences in other peoples tanks. Cheers.