The golden rule when adding African Cichlids........to an established African Cichlid tank is to rearrange the rocks and hides. I learned the hard ways 3 times (didn't know any better). I lost 3, $15 - $30 africans to obvious (now i know) territorial issues..........They just got so stressed from being chased non stop from the "alpha" males that they got beat up and eventually (next day) died..............sucks hard............but a lesson learned..........