Weird Question about Live Rock

[NySharkBait]

I'm removing my RBTA from my tank. I've flipped the live rock he's on to allow my powerhead to "blow him off." On the underside of the Rock is a few spots which could best be described as dried glue in appearance. I can't get a good pic of it right now. Any thoughts of possible IDs?

 

[jgraz]

sponges maybe

 

[anthonys51]

i wouldn't worry about it, if that was why you where asking the question, but yes like metsin16 said probably a sponge of some type.

 

[NySharkBait]

Thanks guys. Took to LFS to have Nem removed. Sponges indeed. Love this forum.