There are a few tanganyikan fish you could keep, I have had a pair of brichardi in a 5 gallon for 4 months, and they are doing great (nice color, very active, growing up just fine)
If space is limited, and a 10 is your only option, I would say that brichardi, or neolamprologus lellupi would be a nice option. They rarely get much larger than 3 inches and a pair of them might give you some fry that you can take to the LFS.