Sounds to me like you need to ditch the Eco Earth. I used that stuff for my BCI girl when she was a baby for about a year and never had those issues. My issues with it was it was messy and stuck to everything. Also if you didn't keep spraying it down, it dried out and became dusty. Also I had it mold on me once and cause the underside of her wood log to mold as well so I threw everything out, tore down her Pro-Line cage and took it outside and completely cleaned each piece with about 3 different cleaners. Then I reassembled the cage and switched to aspen and haven't looked back.

I'm at a loss as like I've said, I've never seen a snake with stuff stuck in their nostrils. Sorry. And yeah pictures would probably help a lot. And if one of your snakes has an RI, I would be very worried about the others. Unless you got a culture done to verify if it was bacterial, viral or fungal as the last 2 are contagious. My beardie had a slight RI which turned out to be bacterial and the vet said the type of bacteria she had was transferred by fecal to oral so my snakes were safe. Of course I pretty well bathed in Chlorhexadine after touching anyone and wiped down every thing once a day at least for the next 2 months. Anyways good luck and hope you find the problem.