eh.... Tropheus brichardi (max size 4.5")? or... Chalinochromis brichardi (max size 4")? or... Neolamprologus brichardi (max size 3")? =P
A 10 gallon is not a good home for any of these. The only tang I would put in a ten gallon would be any of the shelldweller species, or julidochromis species.