What Is This?

[Nosaj82]

Wondering if someone could tell me what this is. Sorry but these were the best pictures I could snap. Hopefully you can see the white filmy looking stuff over the rock.

It reminds me of some sort of nest you would see from a spider or some type of bug.

 

[DSC reef]

From the pic it looks like sponge. Harmless filter feeder.

 

[Lovemyreef2015]

+1 sponge. Harmless

 

[PEP12]

+2 sponge good for filtration

 

[Nosaj82]

Great new. Thanks.