Aside from the tank size, Malawi cichlids aren't pair-bonding fish like SA or CA cichlids. Typically a single male and 3-4 females is the best ratio, preferably in at least a 75 gallon tank. More than 1 male of any given species is likely to be picked on or killed outright by the dominant male unless there are 10-12 of them to spread the aggression around enough that no one fish gets hammered.
There really aren't any cichlids (aside from possibly Lamprologus multifasciatus) suitable for pairing up in a 10 gallon tank, even the relatively mellower SA or CA species that can be housed in a 20L for breeding are best paired up in a larger tank first. Cichlids are territorial fish, and when one or a pair claim a territory the others need room to get away or they'll be killed.