Not a Goniastrea; true Goniastrea are more pale/cream-colored and have prominent paliform lobes like this:
New Caledonia | Credit: Brigitte Leroy
It's more likely a Favites or subcerioid Dipsastraea.
New Caledonia | Credit: Brigitte Leroy
It's more likely a Favites or subcerioid Dipsastraea.