Is this red alge? How do I get rid of it? !!!

[Wade]

[img]http://www.canreef.com/photopost/showphoto.php?photo=3740&password=&sort=1&cat=500& page=1

[/img]http://www.canreef.com/photopost/showphoto.php?photo=3741&password=&sort=1&cat=500& page=1


I dont know if the photos made it to the post, just guessing on how to post them

I have this stingy, dense, branching stuff growing on my live rock, it is spreading fast and furious!!, Anybody know what it is and how I can stop it? I is a redish purple color