I have a tang community and it is awesome to watch. The tropheus populate the upper areas generally and are rarely still, always someone chasing someone.
The mid and lower areas are taken by the bright orange leluipi, altos, shellies and juvie tropheus. The dark tropheus, bright orange leluipi, golden altos and pale shellies all contrast well off each other colour wise and the blue back ground and algae covered rock piles make it an interesting setup.
There are other species around like julis as well that you can keep so not too hard to get hold of a few tang species.
If you do want to go with tropheus the tank foot print is very important. i wouldn't put them in anything smaller than a 5 foot for a single species of troph or at least 6 foot for two species (duboisi and one other species) as they won't have the space to create their own territories. I have a 2.0m tank that is only 450mm high and 450mm deep, works awesome.