It's good for both of them. Frisco will attack and kill Icarus if I leave them in the same cage When I first got Icarus, Frisco ripped him and ripped all the flesh and muscle off of Icarus's shoulder and so his shoulder blade stuck through Now his shoulder is gibbled They will stay together long enough for me to take a picture, but that's about it. They were doing fine for a while, until my mother told me that they couldn't sleep by the computer, and the computer was the only place that they would stay together, so that was that.
Frisco even attacked my other rat, Fink She couldn't get pregnant at the time, because she was so young, so I figured that Frisco wouldn't attack a baby, much less a girl, but she started bugging him, so he did. Icarus did very well with her though...