I noticed today while soaking my tortoise that he was whistling a little bit, it’s not every breath but I haven’t heard this from him before. I checked his eyes and nose and I notice no discharge or mucous. He’s eating and pooping fine. Still active. No other signs of a URI? has anyone had this happen before? It’s also pretty dry where I live this time of year so I know his humidity isn’t to high (it’s like right in the middle) not super low- around 55% which I know is low but he’s also an adult tortoise not a baby.