Hi i have a 55 gallon tank with 2 convict 4in, 1 green terror 4in, 1 jack dempsey 4in, and 1 common pleco 2in. My convicts rule the tank and are good buddys it looks like, they are both males along with all my other cichlids, I do not have a really severe aggression problem in the tank just that my green terror is pretty beat up not his fins but he has missing scales and the other fish are more agressive towards him and he does not stand his ground he used to until he got beat on by my one or both of my convicts, the green terror is not very stressed and i dont have another tank so that isnt an option for me. For those of you have owned these fish and have had this problem please give me some advice? I only have two small structures in the tank so that might be the problem but im not sure? I need experiences anything that might help me?