What is this growth/algae/sumthin

[takeaction]

Found this on my new live rock as well as some hitchhikers, any ideas what it is, still new to this game i am.

and here's a pic of my tank, still in the cycling period, gonna paint the back blue, not likeing the bricks behind.

 

[Reefscape]

If possible, could you try and get a few more snaps of the hitch-hiker for us?

Niko

 

[BIGgourami]

looks sponge like to me