When I first got my two rats one of them had a minor respiratory infection. It started off as some minor sneezing (they had been living in a 10 gallon fish tank so I thought it would go away once she was moved into a ventilated cage) but over the first five days it just got worse (it became more frequent sneezing and it sounded more mucousy) so I gave her some antibiotics. Her sneeze got much better now she only sneezes maybe once or twice while out during play time, not in her cage. My other girl stayed perfectly healthy over the past month. But now she has the habit of loud squeaking and other strange noises while playing in her cage and doing other things. I am always worried that she is getting hurt but whenever I check on her she's fine, usually playing with my other girl or just doing ratty things. I am wondering if maybe she got used to being loud while sick and has gotten used to making noise?