In my 29g BioCube my stocking (will be) 2 Banngai Cardinals, a Blue Fin Watchman Goby, and a pair of Misbar Ocellaris Clowns. Definitely get a Watchman Goby they are very cool! For the other room in the tank go for something like Cardinals, or RGBs.
29g BioCube Reef Tank:
2 Ocellaris Clowns, Green Mandarin, Blue Fin Watchman Goby, a pair of SSKS, Zoas, Mushrooms, and Hammer Coral.