My favorites based on appearance are.
Kribensis
Severum
Clown Loach
The only of the three that may be ok in a 29 is the Kribensis but durning breeding time that fish will want every bit of the bottom half of that Aquarium.
Here is where I get most of my information on fish.
http://www.elmersaquarium.com/000tropfishcareguides.htm
Can anyone verify for me that this site gives good advice. It seems good to me. But I am still learning.