Zepplin,
What's the skeletal structure of the mouth look like, or feel like? Does it seem to have a deep mouth? Are there extra pointy teeth surrounding the mouth, like a Cynarina or Scolymia? My first impression was a Fungia. I've seen baby Fungia attached to rock, but that does not look like others I've seen. They are usually attached with a very thin piece of skeleton, easily breakable. Your looks very thick.
My best guess would be Indophyllia. I haven't seen many pictures of this coral, but it fits the decription very well.
http://www.advancedaquarist.com/issu...003/invert.htm