Stuff on Live Rock

[fishcrazee]

I noticed this blue and yellow stuff growing on my live rock..... there is another spot of it farther back, does anyone know what it is? Some type of algae?

 

[tike]

Well the pic isn't that great to really tell .......but in a shot in the dark(no pun intended!) I would say they are sponges. Nothing to worry about if they are!