Your pictures are amazing!! How deep were most of them taken? Wow just wow.
All dives less than 60 feet maximum (20 meters) except for the Pigmy seahorse which was just over 79.
Most of the best life on any reef is in the shallows where sunlight can penetrate . So the best zone is 40 and above. Most of the world speaks in meters and 20 meters or less for most divers there.
When I was younger and a wreck diver I went to Truk Lagoon 3 times and did extensive decompression air diving as deep as 200 feet taking underwater photos which today is done very easily with mixed gas with no worries .At the times I went that was not the case.I worked hard at diving early on and became a dive master in 1985 in Little Cayman Island all while doing pottery as well. That was when I was younger traveling with some ex military folks who loved wreck diving and photography-in fact I got this U/W photo bug from them in the early 80's. Now as an older diver with a huge amount of dives in I limit myself and would never dive deep .You have to know your limits as to narcosis (which sets in like a two martini drink at depth which makes you a little drunk and is dangerous )It used to hit me at 120 feet and and now I have no idea what that depth may be. This fuzziness can effect everyone much differently . As a life time of non smoking and not drinking I tend to have less issues at depth. Things like sleep and body mass also factor into this as does age.Working with this takes training and training . I have seen just about every thing go wrong underwater-its like flying airplanes it not the 1st thing going wrong or usually the second it the 3rd and who you train for that and if that takes clear thinking and no panic.
The last note on deep diving is a recompression chamber for the bends. There was not one on Truk but the plane came 3 times a week. In Wakatobi the flight into the only airport on another Island is once a week-That flight is 3 hours and would cost 18 K for a special flight so safe diving is key. In most remote world spots recompression chambers are days or week away and that factors into all dive plans. All dives at Wakatobi are maximum 70 minutes and usually 20 meter maximum depth. I spent lots of time at 35-45 feet and long safety stops on the shallow reef tops in 10-15 feet off gassing .
As I mention habitats are critical so knowing that nudibranchs like it 35-50 feet you can find more of them there or say Pigmy seahorse like the currents deep. Or sea fans and crinoids like more current all makes for getting better photos.For every good photo I have 10 times more bad ones. It used to be for one 36 roll of slide film I would feel good with 3 good photos now with digital I can see them underwater and make adjustments but with current and location it not for the impatient.In fact my biggest asset for underwater photo is my patience mixed in with my experience. Which is the same as in my pottery business and all things ceramic.
OK I'm rambling and need sleep as its still 18 hours ahead for me and day is night.