Welcome
Omoplata!
Africans are great! So much fun to watch! Just wait till they mature and start to get really fun!
You are going to have trouble with a couple of your choices tho and soon.
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4 Demasoni
These need to be kept in huge groups, of say at least 12. They are very co-species aggressive and one of them is going to go on a killing spree soon and knock off all the other Dems. You will be left with one. That is just the way they are. You need a large group so that the dominant one has too many to pick on to do much damage. With only 4, he is going to get the other 3. With Dems its either 12 or more or just 1.
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1 Venustus - 4 Livingstonii
These are Haps and these guys are going to get waaaay too big for your tank. They need a 75 or bigger. They will all get over 10.5" and 5 fish that big in a 55 is just not going to work
My advice is to return the Demasoni, Livingstonii, and Venustus and build on the other groups. Haps and Mbuna are not a good mix. Get yourself some more Red Zebras, say 3 more females if you have a male. You can tell male Reds by shining a flashlight on them. If they have a blue sheen to their fins its a good bet its a male. Its best with Mbuna to have 1 male to 2-4 females. If you have more than one male in a group they will fight for the females. You can then add another small group of Mbuna, a male and some females. Acei are really pretty fish, a nice purple with yellow fins and pretty mellow.
I know that they all get along great now, but they are young and as soon as they hit maturity at about 2.5-3" all heck is going to break loose in there. Better to fix it now when they are young than have disaster later.
Good luck!!