Why? 2 red zebras will be fine for a while. This is mostly going to be a planted tank might not even get labs.
Do you know the sexes of the fish? Like it was mentioned in your first thread, these are not to be kept as multiples unless you are doing the prototypical all male, "overstocked" tank OR as a breeding harem of multiple females per male.
With two males they are not going to be so buddy-buddy once they begin to mature and stake out territories. With one of each your female is going to be harassed once the male gets into breeding mode. Hopefully you ended up with two mild mannered females...
Also, Mbuna literally translates to "rockfish"...these are NOT fish suitable for planted tanks, especially considering they can easily uproot and feast on the live plants as if it were salad.
Do what you want, but don't act like you weren't warned.