So a couple days ago one of my rats sadly passed. I had two & both were on antibiotics for an upper respiratory infection for approximately 10 days. Today, i got another rat to be his new friend since i didn't want him living alone & being alone can be bad for his health. My rat Cheese (the one i already had) has improved a bunch since his medication, but he's still letting out some sneezes. When is it safe to house them together ? i don't want my new baby to get sick, i want to make sure Cheese is completely better before i put them together. & How long should the antibiotics take to clear him up?