What are these white "branchs"?

[Krollo]

Just noticed these white branch looking things. They seem to only show up at night and early morning mixed in my polyps. I had to shine flashlight on them to try and get a pic. They will retreat if light is left on them for long. These are the best pictures I could get

 

[Datreeferman]

Looks like a branching sponge(a completely harmless filter feeder).

 

[Krollo]

Thank you for the response, I will have to research them later