The best way in my opinion is to get some emerald crabs, they will eat it along with other nuisance algae that other clean up crew members won't touch.
The only other way is manual removal. Make sure you have a small siphon pointed at the point of removal because it reproduces by sending out spores that will attach elsewhere and pop up another colony in a week or so.
The ultimate way to control any pest algae is to be in control of your nutrients. A good combination of export systems (macro algae, skimmer, GFO, biopellets, deep sand bed, carbon dosing) should out compete any nuisance algae in your display.