I do not know. But if I had to give you an answer NO. Male betta's are odd fish. Some will go fine with anything, while others will kill anything that moves. so your best bet for a tank mate with a male betta is five pieces of glass and maybe a dwarf frog or two. Oh I've read that male betta's can go with white cloud mountain minnows but I wouldn't push my luck. sitck with the african dwarf frogs, i'm almost sure they would be able to get along. and if not then they can go in your 29.
edit: anything else?
well i'm off to bed i'll give you another 2-3 mins for a final question or two but i'm bone tired and it's 3 am. I was going to bed when I came across your thread. I hope i've been helpful. remember to be patient. You've gotten this far in the fishless cycle don't get frustrated now. It should be ready in time for the new arrivals.