Rules of thumb expecially with SPS placement are hard to derive. Each tank is different, and what may look good in one spot in one tank may look like pooh in another.
Trial and error is the best placement advice one can give, I move mine several times.
Due to flow, light, and water parameter differences in each of our tanks, its nearly impossible.
I am finding I have too much light and most do better towards the bottom, but I have 250DEs that are close to the water on a shallow tank.
Personal preference is the defining factor as well. Some LOVE the pastel look of the Probido, Zeo tanks.....I love how they bring out some things, but am of the opinion they are starved and are too "colored".
In a tank like mine, with smaller water volume compared to yours Brian, and running a BB system....my colors change rapidly. Its riding the edge of super saturated, dark, vibrant colors is what I really enjoy currently. It seems to bring out ALL colors for ALL pieces across the gamit, showing the colorful tips and little differeneces that make each piece shine.
Mark rode this edge very well with his current tank, and I have really enjoyed seeing the success he has had with it. He was able to get some amazing colors, even to the point of heckling me when his superman digi was blue and mine wasn't. I hope he has the same great results with the new tank, because his new tank will have a new personality for him to get used to. I am sure, he will whip that bronco into shape and show me up soon enough. I just need to enjoy it while I can!!!
Guess what, I moved the Superman digi lower and now it is blue........how was yours Mark?.....
Trial and error, and flow/light/stable water params give the best colors.
I did recently read that it is thought that the "blue" corals come from deeper depths. Most of the smooth skinned pieces, are "deepwater", but trying to mimic the ocean is a big mistake and our tanks compared to the ocean is apples and oranges.
See what works for you.....