I thought at first that it might be a baby plate coral,but there is no skeleten.It shrinks up like a anemone when it eats and the body/stem stretches and contracts between light cycles.It came on a new piece of indo live rock two weeks ago.It's about 1 inch in diameter and the tenticles are double the length shown in picture.Right now its in a low flow spot in my tank for acclimation(hence the algae on rock,cleaning crew's on it!)