What are the dimensions of your tank?
You'll probably want to stick to the stocking of a standard 55 gal of 12-16 adult fish. You can go with more species of less individuals (1m/2f), or less species of more individuals (1m/3-4f), I recommend going with the latter, you really get to see a more natural interaction with you have more individuals of a species.
labidochromis caeruleus peaceful by mbuna standards, m/f ratio doesn't matter
pseudotropheus acei also peaceful, will mostly be seen in the upper part of the tank, again m/f ratio doesn't matter.
Ps. Zebra, this "scientific" name is often given to several different species (and there is also a
p.zebra)
The most common is
metriaclima callainos, fairly aggressive, 1m/2+f.
http/www.cichlid-forum.com/profiles/species.php?id=787
The other common one is
metriaclima estherae, also fairly aggressive, 1m/2+f
http/www.cichlid-forum.com/profiles/species.php?id=1730
Here's
p.zebra for comparison.
http/www.cichlid-forum.com/profiles/species.php?id=934
pseudotropheus saulosi, another fairly aggressive species, 1m/3+f, shouldn't be kept with yellow or blue fish to avoid aggression from dominant male.
pseudotropheus demasoni, interesting fish, should be kept either as 1 individual or 12+ due to conspecific aggression. Can be somewhat delicate as far as health. I recommend either keeping them in a species tank or with only
labidochromis caeruleus as tank mates.
melanochromis johanni highly aggressive, recommend 75gal or larger due to high aggression, 1m/4+f
Moorei Cichlid (
cyrtocora morii), hap, gets up to 9", not suitable for your tank.
Yellow Peacocks, I don't recommend these, they wouldn't be able to handle the aggression of the mbunas.