I have a 3.5" leopard ctenopoma that was great for a while. He began to bully a 2.5 inch severum who is a weenie. I figured it would resolve when the severum well outgrew him. Well now all of a sudden he is going after others such as my african knife and rainbow cichlids. Him and the rainbow were hanging almost in a pack for a while. He really goes after them when he does. It's not a territorial thing he ventures out to bully I have never heard of them being this bad.