I have a bunch too... They seem to be fine a lot, but Julia doesn't like being chased from behind which is what Moby does. And he doesn't go away when she hisses at him. She bats at him and when he doesn't move she bolts (and he chases again). I thought it was playing at first but maybe it's aggresion? They ok most of the time, but can't really play together (Julia isn't used to it), and they're too paranoid to be too close to each other. I wouldn't care, but Moby keeps getting cuts on his nose.