try grammas or cardinals, maybe a fairy wrasse or some kind of chromid.
there's really a lot of options for 29 you just gotta think a littel more.
also pretty much any type of goby, except for the largest ones.
i have two 29 gallons at home, 1 has a yellow headed sleeper goby, a blackcap gramma, a perc clown, a blue chromis, and a firefish, it's mostly an SPS reef and i have a few shrimp and sponges in there for color.
soft corals are also nice as the wave about, in my 29 biocube i have a blacka nd gold chromis, a velvet damsel, a molly, and a blue devil damsel, i also have a baby fuzzy lionfish, i'm going to relocate the damsels, once i get a 55+ tank going (should be around june) and the lion is going to have tyhe tank to himself. i have a head of green star polyps, some hammer coral, a few red shrooms, and some candycane corals in that tank.