I have three rats and one of them was sneezing a lot yesterday. When I held her to my ear, I heard her lungs ‘rattling’, i could hear her breath. I’ve monitored all my rats very closely, I cleaned their cage, and they seem to be fine, but they do have a slight bit more porphyrin that usual. Bumble (the one I was concerned about) is not sneezing any more. When she was, before she sneezed, it looked like she was hiccuping? Should I be concerned? I know these could be signs of a URI, but they seem to be fine and they are still playful. I’m getting them a bigger cage (Double CN) in about a week, i found a used one. Their cage is fine for up to 4 rats, I got it used, very very old cage, but it has small doors and it’s made of galvanized metal (not good). The new cage will be easier to clean, will that make a difference?