I got an eight inch buttikoferi from someone who said he was too aggresive and was killing everthing else in his tank no matter what size the other fish were. I have him in a 55 gallon tank with plenty of driftwood and rock. I created some nice hidding spots and plenty of open swimming. I also just recently received 15 one inch colbalt blue zebra's, 2 on inch jeweled cichlids and a 5 inch pleco. I wanted to see if putting that many fish with this buttikoferi would make him more agressive or since I made some many nice hidding spots would he calm down since they were smaller and faster. The zebra's are all getting along, everyone has found certain spots that they like, colors are beautiful, no fins nipped, the Butti still like to move stones around but he has no left all of my plants alone. He is calm swimming around and settles down at night behind one of the bigger rocks when I turn it to the moon light. But unless I go larger in tank size I won't be adding any more fish. One of the most aggressive cichlids tamed by a well maintained tank with many other cichlids. Who would have thought that would happen!