Feather looking algae(?) on glass

[heliothryx]

Hi you all!
This feather looking algae appeared on my glass today. Feels hardish and is white in colour.
Tried googleing, but the word feather only brought up info on feather dusters and the kind of feather algae that is green.
New to reefing and the tank has been running since end of November with live rock.
Any help identifying this would be appreciated!

 

[afishbestservedcold]

snail eggs of some sort?

 

[heliothryx]

Googled and for sure. Thanks a lot!

 

[G Santana]

Love residue!!!

 

[king aiptasia]

its good snail eggs