Young Jacksons can be housed together, and when I say young, I mean up to about 3-4 months of age and then they should be seperated to individual cages. You can keep them in small groups of 5-6 per 18"x18"x36" cage. But at 3-4 months you should seperate them. I don't recommend keeping a male and female together that are older than 4 months. I placed my male Jackson in with my females this weekend and I had to stand there and break them up. The female was not happy about him being in there and the male was behaving very aggressively. I do keep female Jacksons together and they get along fine, just has to be a very well planted, roomy cage. I don't recommend keeping males with females. Even if you did and they seemed to be O.K. with it, you can't sit there and referee them 24/7, and eventually you would need 2 cages when the female became gravid, so it's best you go ahead and get 2 cages now, because you'd need them in the long run anyway.