white film

[Chapin874]

I have this white film stuff growing on the bottom of most of my live rocks. It kind of looks like cotton but not that thick. Is it some kind of algae???

 

[Mermaid]

might be a sponge? lets see it, post a picture!
mermaid

 

[reefrunner69]

might be a sponge?

That would be my first guess

 

[kwan]

I had that and it turned out to be a sponge.