I'm reading this as what Africans can you put in your 29 that will breed and have a lot of color...
Most Mbuna species max out at around 5 inches and are plenty colorful. If the water conditions are good (frequent changes, correct temperature, and PH) they will breed like crazy. Mbunas live in very crowded environments in the wild and naturally thrive with several other fish sharing their living quarters.
Put in lots of rock and use pool filter sand and make it deep and you'll have fry in no time. The Yellow labs are extremely quick to breed, at least that has been my experience. I can't imagine the others being any different.
Good Luck and post some pics when it is complete...