Future 29 gallon tank stocking idea?

I'm worried that the tiger barbs will be aggressive if the pack is too small. I really think that's risky. Tetras are okay, but FYI, tiger barbs are also very nippy and I always consider tiger barbs nippier than any tetras. Be careful about livebearers because when you add a female, your tank has the probability to be overstocked (except if you plan to breed them)