Excellent stuff, Alex.
Trying to give a helpful critique - as you are already doing a damn good job - lighting-wise you sometimes seem to have the lighting coming from the top a bit too much (so the top of the critter is better lit than the front - which is what is facing the camera). This also means that you often light the background reef as well as the foreground - which lessens subject separation and image impact. Notice how much more impact your black background shots have? You can get the same impact from reefy backgrounds with careful lighting.
I also think that there are too many shots in the gallery and a bit too much repetition. People look to photographers to edit their images - we want to see your best shot - not the 4 versions of it.
Best to leave people wanting more than not making it to the end of your gallery. If possible try to include more variety of shots in there. Black background after black background critter shot looses their impact. From time to time try some long exposures to burn in some blue backgrounds. Variety is the spice...
Anyway, I hope you look at your pictures and pat yourself on the back on a job well done. And please take my comments as constructive. I spent most of yesterday having my images critiqued by another photographer. It is always a useful process.
Excellent stuff.
Alex