29's are odd tanks, with the small footprint and a taller water column. you need to stick with smaller fish that aren't too territorial. I copied this from jonah's aquarium site, compatibility page.
orange spotted sunfish aren't on the list, you would probably be ok with a pair of those, especially if you got females.
Tiny Fish Tank:
Elassoma zonatum, banded pygmy sunfish
Elassoma evergladei, Everglades pygmy sunfish
Elassoma okeefenokee, okeefenokee pygmy sunfish
Etheostoma serrifer, sawcheek darter
Etheostoma fusiforme, swamp darter
Pteronotropis stonei, lowland shiner
Lucania goodei, bluefin killifish
Heterandria formosa, least killifish, pygmy livebearer
Lucania parva, rainwater killifish
Cambarellus shufeldtii, dwarf crayfish