Ok, I'm assuming they are Aspen shavings, those are ok. Stay away from pine and cedar, they are toxic.The temp is a little on the low side. What are you using to heat the tank? The humidity is also a little low. Coconut husk is much better at keeping the humidity up. Also, a heat light will dry the air out faster. What is the blue stuff called? Blue coloration can sometimes mean copper which is bad for amphibians. Other than that, does he have any discoloration or blotches? Does he seem bloated at all?