Hmm thanks for the suggestions. I will try offering him food a little more frequently. He has also been spending time resting his head on his hide at and angle or knocking down his thermometer and resting his head and neck flat on that. He has no issues with balance though, so it's not stargazing from what I have read. He holds his head quite steady when poking around or staring with his head and neck off the ground. Tonight I was talking to him through the glass and he very slowly started coming towards me with this intense focus.

I'm really at a loss, here. Maybe he just needs to be fed more often.