Any idea what this is?

[jfreeman]

 

[Tahoe61]

Looks like sponge to me.

 

[Sk8erSpanky]

Do they move? Its a tough picture to see. Do they come out only at night? If it does not move, like the above poster said, possible a type of sponge.

 

[Dalmatia]

Looks like sponge to me.

Thumbs up to that, Sure looks like sponge

 

[Dalmatia]

This is some on my clam, nothing to worry about,