Keep em in at aleast a 15 to 20 gallon... I would suggest buying four brichardi's and starting with the two that pair off. Don't have any other fish in the tank (you can have fish them with, but the more fish, the more they will concentrate on defending their territory), keep the water clean, ph of upper 7's to low 8's (mine is at 7.8-8.0) and keep the water at about 78.
Brichardi's are one of the most prolific cichlids, and will breed, if they aren't cramped, and there isn't a struggle for male dominance or territory taking place.