Are any of these compatible?

Wow. That's alot! What size tank?

Lol, that's what I thougt at first too. Well, we still need the tank spect to make any suguestions.

I dont know the sizes of many of those but the julies and ant shell dwellers would be fine in a 37 just rember if the fish is like 5-6" only get two if there smaller get three or four. If you add some more filtration a lot of people over stock african tanks to curb aggesion but this requires a lot more attention on the behalf of the hobbiest in daily water checks twice weekly water changes and lots of filtration.

Tropheus duboisi lose their spots and take on a different pattern as they mature. Being aggressive they would require a larger tank (75-gal) and do best in species tanks. Herbivore.

The socolofi is best kept with other mbuna (I didn't recognize any other mbuna on your list). Herbivore. 55-gal minimum with these guys.

The julie (an omnivore) probably best kept with other Lake Tanganyika cichlids of similar dietary needs.

In a larger tank it's probably feasible some sort of combination of the above three might work. I wouldn't try it with a 37-gal.

Not really familiar with the rest of your list.

Not really too small, but you are limited to the smaller species. You will want to keep fish from the same region of the world, most cichlids come from either africa, or south america. Also look at the maximum size of the fish. You will be able to keep more fish if they do not grow as big, and some fish will be just too bit for your tank.

The cacatoo is a really nice fish. I would go with a pair of those and add a school of tetras(also from south america) for dithers(a term used for fish that school in the open area, drawing out shy fish). Or you could nix the cacatoos and go with one of the other SA dwarves.

If you are into the african dwarves (multies, dickfields, etc) You could have a colony of one type, or possibly mix 2 species. I like to have a more active tank, and finding suitable dither fish for an african tank isn't as easy.

Depending on which way you go, you will need to set up your tank a bit different. The SAs like soft acidic water, plants and driftwood for cover, while the africans will prefer harder water with more rockwork.