I have a five star general that is very aggressive. I am very surpised that they are not attacking the Umbee being that you have so many of them. I had him in a 300 gallon tank with a female red terror, a male and female grammodes, two escondidos, a male and female green terror, a female salvini, a female nicaraguense, a male convict, and a red jewel. Thay all range from 3 to 5". I had to remove the 5 spot (5 star general and the convict), because of aggression. I will be removing the female green terror also. Anyway, I was wondering why you are not experiencing any aggression problems?