That an issue I am having, I was hoping for a larger pair. I don't have the space for another grow out tank, and geting them small, I run the risk them getting harrased or even killed by other tank mates. I think I will stick with trying to find a male and female of a larger size. And if all else fails, I 'll get the 3'' and hope for the best.Get them young and raise them together. I have an all-male severum tank and there's no major aggression. Throw in a female and everything goes to hell.