A worldwide community photographing and learning about wildlife
Platygyra sp
This is definitely a hard coral, and it's from the genus Platygyra - most commonly known as brain coral. It's hard to ID coral to species level from photos, so I think for the ID it's best to just put Platygyra sp.! It looks like it's not in too good health, those white patches are signs of either disease or bleaching. But it's a really good spotting, these corals look so neat!