Heaps of nice fish come from Lake Tanganyika and they are much more peaceful than the stuff from Lake Malawi.
Have a GH of 350ppm+, pH above 8.0 and give them lots of hiding places and buy a group of young fish and let them grow up. Male Tropheus tend to bash smaller males and you usually end up with one big male and a group of females.
Tropheus are true vegetarian fishes and don't do well on meat foods. You can add a small amount of newly hatched brineshrimp or some daphnia to their diet, but the main part should be plant matter and vege flakes/ pellets.
A couple of nice fish from Lake Tanganyika include the Cyprichromis and Paracyprichromis groups, and Lamprichthys tanganicanus.