algae in new tank

[Melina]

My tank is 1 1/2 months old, and currently there is a huge bloom of green filamentous/hair algae on all the rocks, the glass, everywhere. I hear that an algae problem is a sign of something wrong with the system, ie., too many nutrients, phosphates, etc. Then I read that such an algae bloom is normal in a new tank, and just a part of the cycle? Is this bad, or normal? Should I be worried? What if anything should I do? I only use RO/DI water, my nitrates are <5. I was thinking about getting a phosban reactor. What are your experiences with green algae in a new tank set up? How long can I expect this to last? It looks so unsightly.