Bark soaks up water and releases it into the air as it dries, creating humidity.I think my tort is feeling a lot better, he was very active today and tried to bite my finger because he was hungry. I haven't seen him have trouble breathing, no opening mouth, no other signs of illness too. Just to make sure I'm going to still keep his enclosure warm for tomorrow and if he is alright tomorrow I'll return the temperatures to the right temp as Wellington said. I sprayed his enclosure's substrate with water to add more humidity. I have Eco earth which retains a lot of humidity and Repti bark. However, according to the Zoo med website it says that Reptibark does retain humidity which seems very odd to me because reptibark is bark. Can anyone help me out.