If your looking at a sole Reef tank with no fish you may have a option, now the equipment setup is going to need some major nature work a refugium is gonna be a must and maybe even a second solely dedicated to cleaning and I would assume a lot of rich with macro algae and living copepods in abundance to supply the food. this is a light touch on some of the things you need I am indeed no expert on the thought but would love to know the exact parameters lets keep this up!
1. Refugium (Mangroves, and what else?)
2. Living Copepods
3. GOOD Skimmer
4. Lots of live rock for filtration and copepod growth
That's where I'm at for now for input lets see if we can come up with a perfect build, if its possible.