Whenever anybody has any algae problems, they are given the following advice:
'too much light. Cheers,'
My experience (and that of many others) directly contradicts this, but those who keep maintaining that light is the root of all evil never seem to be able to respond to experiences like this or provide an explanation for why this is the case.
When I had no idea what I was doing, my tank did fine. It was only when I started to mess around with Co2 and high flow that I started getting problems.