Deep water piscivorous Cichlid from Lake Tanganyika. They live in colonies in the wild and one will get the best of his or her fish if kept in similar conditions.
Avoid using jagged rocks for the aquarium scape, frontosas can get seriously injured as they "dart" for cover. Smooth rock, or just plain open space is preferable. Schools of at least 12 individuals, preferably 1/3 male to female ratio ..in a minimum 180gal tank.
Tankmates? Altolamprologus Compressiceps, Calvus; Neolamprologus Sexfasciatus; Lobochilotes Labiatus; Ctenochromis Horeii ...and if you want a more exhaustive response PM me ...never go for silver, sardine like medium/large fish, so no Cyprichromis species, Haplotaxodon Microlepis, nor Bentochromis species (Tricoti or Melanoides).
Oh... feeding regimen: sinking pellets exclusively. You don't want your frontosas to come to the surface and "GULP" for their food. That's how one of the deadliest afflictions develop, it is called FLOAT and it is caused by the air caught in the Frontosa's innards. Deadly.