It's tricky, the skeleton looks thin and encrusting, the polyps are very close together, they seem to have little balls on the tip of the tentacles which you often see on gonis.
I'd rule out T peltata for sure.
Jeez, don't defer to me:bigeyes:...I'm just not convinced it's a turbinaria sp. Unfortunately, unless we see some skeleton we're pretty much guessing.
Probably not stutchburyi (describes tapered ends to tentacles), this one definitely isn't tapered at the end. Judging by the size of the polyps versus the cabbage on the right, I'd expect the corallites to be no more that 2mm across.
I think we have a winner!!!
Goniopora stutchburyi:
Characters: Colonies are submassive to encrusting. Calices are small and shallow, giving colonies a smooth surface. Polyps have short tapered tentacles which may not be extended during the day. Colour: Usually pale brown or cream, sometimes with pale blue mouths. Similar species: None, but could be confused with Porites. Habitat: Shallow reef environments. Abundance: Uncommon.