What is this growing on rock !!!

[Henressy]

What’s is this any one know it started last week on rock it look like white fuzz?

 

[LiveFreeAndReef]

I see what you're referring to but its hard to tell what it is due to the picture being out of focus

 

[Henressy]

I think it a sponge type and I have a small pineapple sponge on rock too

 

[LiveFreeAndReef]

I think it a sponge type and I have a small pineapple sponge on rock too

Love those little guys, although they're not great on pizza ;Joyful

 

[Henressy]

Love those little guys, although they're not great on pizza ;Joyful

That’s funny yeah are sponges good for a reef tank??
or should I scrape it off with r/o water