Was finally able to sit down and read through your entire article. I think it'll be helpful to people who have problems shooting their reef tanks.
Remarks from the peanut gallery, for what their worth: I've found that chromatic abberation is less in tanks that are made with starfire glass or glass of equal quality(Elos so far has the best clarity with macro shots), something about standard green tank glass really messes with colors close up. I think it might also be light related too, but haven't quite figured that out yet. Flash seems to help me, though I just use my onboard flash ATM.
This was shot through the thick glass of an Elos tank, and I always get the best results in this tank, probably thanks to the glass being such high quality...
And one shot through the glass of a standard 75gal breeder... I tried to fix as much of the chromatic abberation as I could along the gobies face and back, but its still obvious... (was also shot at a much higher ISO).
I've also always had alot of problems thinking my shots are totally sharp, but then when I got back to a computer, found out their all slightly out of focus... I think water distortion just gets the better of our cameras/lenses, and after a certain depth, there just isn't anything we can do about it...
I do if at all possible try using an f-stop of 10-18, and this keeps most things pretty crisp... But if at all possible, I bring stuff like coral foreward in the tank if I need to get a good crisp photo of it... As with fish, fish are my nemesis and I suck at getting shots of them.. lol. I rarely get any good shots of fish due to their constant motion.