please help me identify this white stuff growing on my live rocks

[gijope]

hi! can anyone please help me identify what this white filmy cotton-like thing this is so i know what this may be symptomatic of? your help will greatly be appreciated.

 

[Zer0]

Looks like sponges to me. Harmless.

 

[Etunes]

^same thing he said^

IMO it looks like a spider web. See any spiders with a snorkel and fins?

 

[Kurt_Nelson]

Looks like sponges to me. Harmless.

Yup yup.

It's just symptomatic of having a saltwater tank!