I don't know if it'd be a very good idea to get a second rat at the moment if you can't properly quarantine him. The rats will need to be separated for a few weeks into separate airspaces (preferably different houses, but if it must be different rooms then be extra careful with handling one then handling the other). I just don't think a 5 gallon would be large enough for the rat for a few weeks of quarantine then however long for introductions.
What's your cage like at home? Is it not the 10 gallon?
I would also not recommend getting a rat from a pet store. They are most likely to have health problems and some are not very friendly towards people (I'm talking from experience here). If I could do it over again, all my rats would come from breeders/adoption even though some are very sweet (Just not all that healthy).
What's your cage like at home? Is it not the 10 gallon?
I would also not recommend getting a rat from a pet store. They are most likely to have health problems and some are not very friendly towards people (I'm talking from experience here). If I could do it over again, all my rats would come from breeders/adoption even though some are very sweet (Just not all that healthy).