Couldn't you have waited to get another boy rat, or girl rat until you were sure that if one should have an injury you would be able to care for them?
No i couldent have
Rosie and Lily were rescues and they were in way worse shape at their previous homes then they are now, they have a great diet and have a nice sized cage. They are spolied.

I got Nimbus because I know that one day one of my males will die and then the other will be friendless, and lonely. ...

Yet again going on to explain my self...