Some sort of Tunicates?

[appleton71]

I have several of the critters in the attached pictures scattered throughout my tank. They come in purple and orange and hitchhiked in on some rock from TBS. They retract when disturbed and then open up like a flower. Any idea what they may be?

 

[vetteguy53081]

Tunicates - Yes

 

[reef lover]

Theyre beautiful!