Strange ID?

[matthewscars]

I have no idea what this is. But they are slowly popping up here and there. Good/bad?

 

[D to the P]

Looks like sponges. I wouldn't worry about them.

 

[sassafrass]

Tunicate sponges to be more precise

 

[lloydkeller]

sponge they come and go, wont cause any problems