Maybe do:
1) Pulsing xenias ( which is hosted by clowns) with a mushroom bottom ( do pick your colours for the tank then look for the corals; I think green corals are the most fluorescent ).
2) a zero reef setup with either a open brain, elegance coral, .... might look neat since it is in a office for others to admire. A rbta might work too but it may move around as well as requiring a sump to increase the minimum water volume to say 30 gallons.
http://reefbuilders.com/2011/09/29/e...-population-1/
http://reefbuilders.com/2011/12/17/reef-east/
http://reefbuilders.com/2012/11/14/nano-reefs-part-2/
http://reefbuilders.com/2010/04/22/e...ano-reef-tank/
I believe one can add a few sexy shrimp as well...but that's about it.
You need to change 100% of water once a week... maybe less if you have a sump where you would have rocks, chateo for a pod population.
3) checkout youtube ( nano cube, biocube, etc ) for ideas: eg
http://www.youtube.com/watch?v=znJ2iTLLYQk&feature=plcp
regs
msjboy