Hi, PuffPuff11 is right, you shouldn't mist him in his tank as high humidity can cause an upper respiratory condition. Do you know what the humidity is in his tank? For proper
hydration,
bathing is a good idea, be sure to test the water temp by the inside of your wrist & to place something like a washcloth or small towel down in the sink or container to help him feel more secure & to keep him from sliding around. A 15 to 20 min
bath is very beneficial, but make sure his vent area is right down in the water for proper
hydration. You could also mist his greens with water and even offer drinks of water or diluted 100% juice (no sugar added), diluting with 1 part juice to 4 parts water. You can put drops on his nose for him to lick off.
Bathing 3 to 4 times a week is very helpful & also helps with shedding and offer drinks like mentioned daily will also help.
If you could answer the questions that I posted in my first post, it would be very helpful as certain things can cause dehydration so would be best to rule things out. Please keep us updated on him.