Hey, you should go out and buy Back to Nature guide to Tanganyika Cichlids. It is a good amount of money to spend on a book, but if you are buying something as big as a 250 just for these guys, you should know your stuff. I find it really insightful and gives you a good idea on max/min sizes of fish, foods, and species it can be housed with. It also gives a pretty good description of its how it lives in the lake. Also watch the youtube videos, jewels of the rift or something, that was pretty interesting.
If it was my tank, I'd stock it with a colony or 2 of multis, each with their own mounds of shells in the back corners of the tank, 3-4 J. dickfeldis, a small school of maybe 10-20 neon cyps, a male and a few female enantiopus sp. "kilesa" kavala, a school of neolamprologus brichardi, a couple plecodus straeleni, and 6 pseudosimoschromis.
My tank would consist of a huge central hill of large, squarish rocks that just jut out that form many ledges and contain many cracks and crevices. no plants, pool filter sand, and if I had any more money... a nice back to nature tanganyikan background (NOT DIY).
That's my dream, yours can be different if you want.... man i love dreaming. now i should get back to my lit term paper due tomorrow.