Two identifications Plz

[bdepierro]

i want to identify the whitish looking stuff on both of my live rocks because i have found numerous specimens in my tank. most of it is located in darker areas of my tank underneath live rock.

 

[little_fish]

i cant really tell what you want me to look at, but im going to guess its a sponge and no big deal

 

[bdepierro]

in the picture on the right its the white thing jutting out from the rock in the opening but thats what i thought they were as well

 

[Bifferwine]

Sponges. Harmless. Enjoy your nice little hitch hikers. :)