Sorry not from that picture. Is it the white and green blurry thing?
At the moment I'd guess it could be a Flatworm of some sort or a Colonial Tunicate.
if you look towards the right end of the object in question, it faintly appears to have a "feather" type object from it..this could be just the image blur...Thats why I guessed nudibranch...Ive never seen tunicates (sea squirts) so symmeterical..I could be wrong...My knowledge is limited..