Sadly, my daughter's pet rat passed away last night after a long battle with mycoplasma. We miss her dearly & we're also now worried about her companion who she had been with since we'd bought them both as babies from a pet shop. We know that rats can get very lonely so we're thinking of buying another baby rat but we're worried that they might not get along so was wondering the best way we could introduce them without too many problems. Our remaining rat is one year & 7 months old (female). Thank you in advance for any answers