I currently have the All Living Things Rat Starter Kit (http://www.petsmart.com/small-pet/c...6-5201419/cat-36-catid-600011?_t=pfm=category) with one rat. I know that rats should be kept in pairs or more, but the way we got Remy was kind of a misjudgment. Basically we saw him at PetSmart and he was so charming and sweet that we had to get him as a friend for the current resident rat. However, Remy was very aggressive towards Nico and before the introductions started working Nico passed away from URI, so Remy was left in the cage by himself, and there are no rescues nearby where I can get a friend the right age for him. But is the cage an acceptable size for one rat, or even two? Thanks for any advice.