Well I have 5 GT living with one another right now but a smaller size about 3-4 inch I believe I have 1-2 males and 3 defiant females, they all hide out in a cannon and play swim a line with one another when they come out with little aggression but are still young so this may change. I did have 2 defiant males at the start and one was killed over night which leads me to think if you have 1 male with a few females it may work out better then all males but I could be wrong with full grown specimens.