Red Sea coral reef and it's beauty, flickr link added...

[Blue Sea Diver]

Canon G10, Canon WP-DC28 housing, f8.0 at 1/60 s, iso 100, flash on, shutter speed priority set.
CS4: curves as letter S .
http://www.flickr.com/photos/47584093@N04/4668524504/

[scottg]

nice contrast between the coral and the blue water. did you try a few other compositions?

[Blue Sea Diver]

Yes, shutter speed priority enabled instead of aperture priority, thus the image background water blue and coral reef appear much brighter, then small CS4 adjustment. With f8.0 at 1/60 s, iso 100, flash on and speed shutter priority set is OK for reef capture where the light u/w not available much and not intensive, the diving time about 5:30 PM., depth about 30 feet. I continue dive with same settings value, and the next shot for coral reef as shown in the below link.

http://www.flickr.com/photos/47584093@N04/4685153750/

[smb2]

Enjoyed your Red Sea subjects. Clearly you have the camera dialed in to avoid back scatter and to get those nice blue backgrounds. In looking at the fish shots, I see that many have the fish swimming away from the camera. Try to work with your subjects to get a natural pose. (Like the Coral Cod.)
Nice work.

[Blue Sea Diver]

Smb2: Thanks for your comment. Yes this is true many fish swim away from camera, need less movement and bubbles while shooting. Quick review to your u/w photos at http://sbysshe.smugmug.com/, truly speaking nice u/w photos collection.

[smb2]

Thanks BSD. What my site doesn't show are the hundreds of deletes.
For the last three weeks I have been diving the same site over and over. It is quite shallow and I usually just sit around waiting for stuff to happen. In particular I have been watching a resident Frogfish hoping she will start her evening rounds. Last night when she started swimming I was so startled that I forgot to take the picture. Thankfully she kept moving from place to place so I could get a few images.
If you go slow or just hang out, most fish forget you are there and that is when you see their faces!

[Blue Sea Diver]

Shooting in shallow water is good, as the coral reef is long and colony, waiting and finding creatures is much fun, moreover diving time is longer, it is less effort while spending most the time waiting to shoot nice pictures. As for my knowledge you need to change your diving sites for u/w photography but I also practice capturing images at the same diving site is ok. Most of my photos is from the same diving site. Also it's difficult to find a particular fish at the time you diving, but some time you are lucky.