My humidity mostly stays in the 30s but can get to 50 on humid days so I don't know why he got the URI you could try those dehumidifiers that are for closets, they are only a few bucks and seem to last a few months or so. I keep one near his cage. No clue if it really helps or not. The site is for bearded dragon supplies and I would pull his lip down with your finger while starting with light pressure, push the syringe against his teeth until he opens his mouth, try moving it towards the front of his mouth down the side to find a spot when he will open his mouth. Keep his head steady cause he will move.