Well, unfortunately, there are a couple things wrong with your stocking already. One, mbuna and peacocks are not pairing fish, so buying just 2 red zebras is a bad idea. One will likely kill the other off, as they're quite aggressive. Which brings me to problem number two - mixing mbuna with peacocks. Not really a good idea. Mbuna are very fast and aggressive, which doesn't work well with the slower moving, more peaceful haps and peacocks. Plus, mbuna require a very rocky habitat, while peacocks need more in the way of open swimming space. I'd recommend figuring out if you want a hap/peacock tank, or a mbuna tank, and trade in whichever fish don't mix for more that do.
Also, buying unidentified africans from a store is never really a good idea. Especially with mbuna tanks (which is what most mixed, un-id'd africans are), you REALLY should research fish first, come up with a compatable stock list, and then look for your fish.