What type of algae is this?

[Jrswish]

What is this type, and its growing on some of my zoas in between their polyps too. I normally only have blue lights on, but have white on to show the algae

 

[i cant think]

What is this type, and its growing on some of my zoas in between their polyps too. I normally only have blue lights on, but have white on to show the algae

It looks to me like film algae, if your tank is big enough then I recommend a Ctenochaetus tang to help eat it, just be warned tangs are aggressive beggars when they get established