Very nice pictures, Marc
It really is amazing how all yuor corals look extreemly healthy
One thing i would comment on is, now that you've got the Camera, Lens, Focusing, Lighting mastered it is time to start experimenting with positioning yuor subjects in your pictures. Maybe try to apply the rule of thirds include a fish giong in or getting out of the picture to add some dynamics to the pic...
You know just bring out the artisitc in your pics. If some of yoru corals are close enough to the glass maybe try to experiment a bit with extreme macros by adding a Teleconverter, or reversing ring or even both. that should be very nice with such healhy corals...