Hard coral fluorescence. Although it looks like it's a painted picture, that's how this coral looks up close.The image is a depth of field stack.

 Hard coral (Stylophora sp.) fluorescence. A crab sits between branches.
 This picture was very challenging as the crab was mobile and I had to stack a lot of shots to get the entire depth of field.

 Hard coral fluorescence.

 Hard coral (Stylophora sp.) fluorescence. A crab sits between branches.

Hard coral (Stylophora sp.) fluorescenceThe image is a depth of field stack.

 Hard coral (Acropora sp.) fluorescence.
The image is a depth of field stack.

Hard coral (Stylophora sp.) fluorescence.
The image is a depth of field stack.

 Hard coral fluorescence. Without fluorescence these two corals look very similar.

 Hard coral (Acropora sp.) fluorescence.
The image is a depth of field stack.

Hard coral (Stylophora sp.) fluorescence.

The image is a depth of field stack.

Hard coral (Stylophora sp.) fluorescence.

The image is a depth of field stack.

See photo in original gallery.