Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
Do some research. Some Cichlids are harem breeders, and one male can be happy with 2 or more females in a 10 gallon. Many more are pair breeders, and to get 1 pair they are OK in a fairly small tank (such as 10 gallons), but to add another pair they will kill each other if the tank is too small, as fat mas suggests. You would need a MUCH bigger tank to safely house 2 pair.
The larger tank is helpful, too, because it can be heavily planted so the 2 pair cannot see each other. Set up the rocks or cave (according to species) at opposite ends of the tank.
Apistos (several different family habits)
Shell Dwellers (family colony fish, and other patterns)
are the two groups I would start looking into.
Neolamprologus multifaciatus are fun to start with one pair. The babies grow up and join the colony. There are some spats, but usually they get along OK. Plants are fine with these Lake Tanganyikan fish. A 10 gallon is OK, but more floor space is better. A 20 long would make a really impressive Shellie tank.