For a week I had two tropheus in my tank. They created bedlam. The male chased the female relentlessly and every other fish in the tank. They are gone now and everything has calmed down again.
The list of fish you have put contains Demasoni. I like them but most members recommend only one as they are highly aggressive. I'm no expert but that list looks pretty explosive to me. Wait for Ferris or Dru to answer your question more thoroughly.
Ferris has spoken, and now so will I
Queue the fantastic Drum roll........
Yes you have a mixture of ultra aggressive fish and ultra calm fish (or so i'm led to beleive anyway)
in my tank (see other thread) i have demasoni, Elongatus, caeruleus and a duboisi, i would NEVER have an auratus in my tank, but thats just me, i know someone who has like 10 of then in a 400L tank and they are placed as you like, so you need to keep an open mind i thin kon these things.
Cheffi is right about the tropheus, they like the demasoni are 'one or all fish' meaning that you can either keep one fish happy, or need a LAGRE group to keep them in check, i have a demasoni and a duboisis single speciemin, therefore they are much easier to keep (damn have i told them my secrets

)
Your elongatus is vertually the same fish as a demo as has already been said, so you have to be careful. I have 2 WC elongatus in my tank, but they never colour up, why, becuase the single demo keeps them in check, anything that looks even remotely similalr to the demasoni is classed as a demasoni by the demasoni and so the chase continues..
Like you say, you have a MASSIVE tank, so probably a lot of the rules associated with smaller tanks may not affect you so much..
if you have the terratory and the space and you are not UNDERSTOCKED them you may get away with a lot of things...
personally i felt sorry for my duboisi in the shop, so i bought him, i would not recommend others to do the same.
if you have enough fish in the tank, your issues with auratus may come to nothing, however the elongatus and demasoin issue won't go away and i beleive it will have to be one or the other, but thats ONLY my opinion.
A tank that size can easily hold 50 adult fish so would seriously think hard about stocking it with fish that you like in large groups, you can always thin them out in time once sex ratios are known.
are there any more malawi fish you are interested in, a small group of Acei would be nice in a tank that size, or maybe some cobalts, put basically the more fish you have in ther the aggression will be less and then any issues you have with feirce fish will be heavily reduced becuase of it?
Also where are you based and are you aware of where you can get the fish you are after from, either by LFS or private breeders??
I hope this helps and it would be great if you keep us informed of what you do and always keep it up to date with some pictures - i love big tank shots, mine is tiny compared to some of the beasts out there, but i'm sure someone will cheer me up by telling me its not the size its what you've got in it

that counts
Good Luck ,
Dru.