This has to be a trick question... I setup my tank with every intention of keeping a mixed reef. Even the equipment and filtration...

I knew I would keep SPS within' 1"-20" of the water surface. Usually near the center of the aquarium to show them off. With large cap colonies on both sides of the main rockwork.

As for the LPS, there would be a few frogspawns and trumpets at the mid range.

Then I have 1' on each side of my tank that has no light, that is where I intended to keep all of my really low light corals. (But, I have caps growing on my sandbed in these areas)

I have a few softies as well, they are in the shaded areas of my tank as well as in direct light.

So, the Zs and Ps are all 14" or more inches away from my water surface. I do need to be more careful when adding Zs and Ps though, as they can get burned easily...

As for water filtration, I went with a skimmer that is a bit overkill for my system just so my wife can pick as many fish as she would like to add to the system. All corals love fish poop after all.