A pair of S. latus (sundburst anthias). If you do a search over at ReefCentral for "deep-water" you'll find quite a few threads I have participated in concerning this type of setup and the philosophy I have pretty much settled on in running it. Most people assume you can just have a few NO actinics and keep some non-photosynthetic corals. They think feeding extra amounts makes up for the lack of light, but this is a terrible misconception. I started with that idea more than a year ago, but all the research I've done since then has changed my final plan considerably. I hope to put together a system, either with a single slope taking up about 2/3 of the tank or two separate slopes on either side with a small "chasm" in between (with the LR stacked to the water's surface or above) to create the feel of a steep reef slope. In the 20H or 18 gal I plan on just adding 1-3 specimens of plating coral, like M. capricornis or T. reniformis. I want to keep plenty of room clear for them to grow and whorl, providing cryptic and shadowed areas throughout the tank. I plan on adding a few sponge spp. to fill in the gaps on the rockwork. To me, it's not just about having lowlight conditions and stocking the tank with animals that can tolerate it (shrooms, zoos, etc.) but actually recreating that environment and the inhabitants found there. It's a pretty simple setup, but I think once it begins to mature and the corals fill out that it will be pretty impressive visually. If all goes well, down the road I would like to translate it all to a 110XH.
Well, that's about the just of it. There are more aspects to it, but I won't bore you all with the technical stuff.