I recently decided to get some african cichlids for one of my tanks. I didn't know much about them so i bought some literature and asked around at some pet stores to see what i would need. I now have 5 small cichlids in a 30 gallon tank. I built a structure out of large calcium coral rocks because i read that they like caves and hiding places. Two of the cichlids both of the same species seem to have made one particular part of the structure their home and chase away any othe cichlid that goes near "their" area. Are these fish just being territorial or is it possible that they are breeding in this area. It is a small cave area on the bottom of the tank. The floor substrate that they lay on is small pebbles.