what is this ??

[andrewc]

I tried to look it up couldent find it what it is I found it on a piece of LR I bought the white thing.. also what's the green stuff?? Thanks for looking

 

[MARINECRITTERS]

Hard to tell, the picture quality is not great.
It looks like sponge to me. Whatever it is, it is harmless.

 

[andrewc]

Ohhkay tank you