I thought it could be toxing out as well....I changed his water last night after feeding so he can have fresh clean water for the night since he spends the majority of the night in there. I did notice the water a little dirty this morning but I did not pay much attention to it since I change the water EVERY night no matter what. I scald his dish with HOT tap water, and rinse it with treated water prior to putting it back.
The substrate is not really wet, just moist. There are no puddles or white mold anywhere. It does look dryer in some parts because that's where the lamp hits. I have been feeding night crawlers for the past two weeks to go easy on him since I just got him. Eating has been great until last night when I noticed him not as aggressive as other days and ate only around half of what he normally would.
One thing I did do was give him a bigger water bowl, its only the medium sized zoo med one. I washed it and treated it prior to using it and kept the water level to under his chin.