Brown Algae...Need help before it's to late.
 

If anyone can help me out, it sure would be appreciated.

I set up a 46 gallon planted aquarium in December and here recently there
has been
a brown looking algae starting to form on the plants and the rocks I have in
the tank.

What would be the easiest or best way to get rid of this algae before it
gets out of control?

Thanks
Charlie Holmes