75 gallon tank suggestions

ok so as some of you may know i have moved all my peacocks/haps in with the mbunas in the 125 gallon and now i have a 75 gallon tank up with no fish in it.....sooooo i was thinkin with my income tax check to try and turn this baby into a Tanganyika tank! I would love to hear your guys input on how i should set this thing up.....it has a black backround and play sand.....fish suggestions??? I really really like the featherfins and xenotilapias and wanted to do something with those fish together....thoughts? thanks

play sand and tangs lots of tangs