I got 4 ball python, 2 keeping in coconut husk without any problem, 1 keep in white paper towel also no problem.. For my banana, he was on paper towel for the last few days, so I change into exo terra soil for the bedding. And within few days I saw those spot on his scale. And the box was alot mist watery inside the box.. And just a mins ago I swap bad to white paper towels and see the results how.. I was guessing that the humidity is too high,