hmmm... I like the topic. My favorite fish in my tank are the Syno Petricolas. They have great personalities... I've got 3 of them... Only about a 1/2 inch each right now... But they swim all over the tank together... All through the holes of my Texas Holey Rocks. Very active. I think Petricolas are a must for a Tanganyikan tank, but just my opinion.
I am partial to my Frontosas also, but they get large, mine are currently about 2 inches long... My Juli Transcripti add some nice color to the tank also, but have been just hiding in the rocks, only coming out for food. Calvi are very nice looking also.