I just took my pastel to the vet for RI because she was making clicking noises and opening her mouth to breathe. The vet said it's not likely to see cases of RI around this time of year. He said he sees most cases around winter time. Since then I've soaked her 3 times and her symptoms have passed. She was due for a shed when the symptoms started so I'm assuming she had skin or something obstructing her breathing. Since your struggling with humidity, try soaking your little guy in a tub with a soaked towel and about a half inch of water (just enough to where he won't be submerged). Position the towel so he can move around on top, or in it. Either put the tub into your tank (that's what I do), or use a pad or heat lamp to keep it at a safe temperature. Leave him in there for at least 30 minutes. (I leave mine in for an hour) That should help hydrate him and loosen up any skin that may be stuck. But if symptoms don't disappear definitely get into a vet as soon as you can!