For a 29G tank, you should be fine. I have a 29G tank and cycling it was cake, if the barbs handled it okay without any probs, then I think your job on the tank is great
- Whenever I redid the tank my biggest fear was illnes, algae (evil kind). The bacteria intro was never a prob, and seeing the way you've done it, you are golden.
Oh yeah, don't worry if you see a sudden spike when this all happens (intro of more fish), keeping an eye out for the levels is definately a must, but don't fret if levels shoot at first, your introducing newer and more fish may increase levels for a lil' bit, but as time goes on it'll be back to normal