First let me say that you have some very nice photos! I wish I could take some that nice, heck I wish I had an UW camera so I could take any!
Honest oppions here...(not being hyper critical, but not pulling punches)
1.intersting shot, love the gorgonians and dendro. Would like to see closer up for further back.
2. even better, would like to zoom out just a little and see more of the right side
3.love it!
4.gotta enjoy the hippocampus erectus(I believe) I would crop just a little of the blue from the top
5.very interesting, sort of wheres waldo... maybe to great of a depth of field, hard to tell what is foreground and what is back ground.
6.much better, with the point of view a little lower, I think you can make out what the object is easier than #5
7.very interesting, I like the shimmer lines on the coral, the fact that the majority of the coral is a neutral moncomatic color with a splash of brightness on the top and a dark spot on the bottom, again very interesting.
8. great shot
9. nice but I think it needs to be more of a close up, or maybe a brightly colored fish in the coral...
10. nice photo, Id like to see it in person, but not quite as a striking image as some of your others
11.I like the distinct top and bottom of this image, but I feel if it were divided into thirds somehow it would be even more of an impact
12.great photo!
13.almost as good as #12, but I think too many fish makes the image...poluted (?)
You have a few shots there that I would not be surprised if I were to see them in print. good luck.