Red Slime Algea questions ??

[surfer 2]

I am starting to get some Red Velvety slimy algea growing on a peice of rock and now starteing to get on my LS in some areas.
What should I do to get rid of it and what causes it ? :help:

 

[reefnut]

Read through this thread>>> https://forums.saltwaterfish.com/t/73002/how-to-rid-your-tank-of-red-slime