If you can get a better pic, that would be great. It may be a plate coral tree. I had one in my old set up in a zoa colony I bought. The zoas are growing on an old plate coral and the plate keeps popping out babies which will eventually drop off to become full adults. Mine used to produce 2 or 3 at a time.
Does it look like this?
If you still have it, I'd LOVE to see a pictureI left them alone, they got along very peaceably and the small plates would drop off to the sand bed when they got to be about 1" across. When I bought my piece for the old setup, the plates were not there. After about 2 months the first one popped up and I thought it was some kind of majano, and so did a lot of other people. Everyone said kill it, I liked it and left it alone and after about a month, it started taking shape and I found another reefer that had one as well. They helped me with the ID. These seem to be pretty rare, other than the one I had, I have only seen two others on the forums.
Me too Mike, I was looking at his photo and saw the white variegations in the center and I almost made the mistake of killing my baby fungia because it looked so much like an anemone. The white striping led me away from aptasia. The ops pic is a little dark, its hard to tell if the thing is brown or there is some green coming out in it. A better pic would be helpful if the op can get it.