I had the same algae when I first set my tank up, thought it was going to be a big problem, in the end it settled itself down and eventually left, there is still a little remnants of it on some base rock I used to build up the reef. after it went through the brown algae cycle as soon as it cleared up parameters went right into check. I then had this weird purple/black algae that looked like a fugus spur coming from up out of the sand. this cleared aswell and now algae isnt an issue in my tank as my levels of nitrate and nitrites are 0 and 0.1mg/l (if that).
should clear up champ!