What is this algae stuff growing in frag tank and what eats it?

[MolaMola]

It is light tan and very soft and tries to cover the bottom glass. Also shown here on tiles and a skeleton. Blows around easily when disturbed. Would an algae blenny eat this? Any other consumers?

 

[Kensington Reefer]

Not sure of identification
algae blenny, appropriate size or smaller bristle tooth tang, rabbit fish
Royal tuxedo urchin

 

[Darkxerox]

Pretty sure they're chrysophytes which I think you can beat by raising nitrates to detectable levels and adding bacteria to compete.