Beautiful wide angle reef scenes are perhaps the most iconic of underwater photos. You're looking to capture bright, vibrant colors of the various corals and sponges and a deep blue background.
These settings will get you started in most tropical blue water environments when you have at least partial sun up to about 30m (100 ft).
A wide variety of salt water environments including the Caribbean, Red Sea, Australasia and South Pacific.
DSLR + MirrorlessISO: 100 to 200
Mode: M Manual
Point + ShootISO: 100 to 200
Mode: Tv Shutter Priority
Aperture: (set by camera)
Shutter Speed: 1/100 to 1/250
These settings are most effective when using your strobes in TTL mode. Position your strobes as far away as possible from your housing pointed slightly the center of the frame.