Read the above links; more info is better.
In the mean time, your cage is to dry. It's obvious in the pictures without looking at the humidity measurement (which still needs to be done). I"ll second the daily bathes, or at least a larger water feature so your guy can go for a dip.
The diet can definately be more varied. Don't be afraid of items like kale, broccoli, lettuces etc. No one single item is perfect, and all have flaws. That's why we use a variety. The bigger the variety, the better chance you have of avoiding any deficiencies. The only items to avoid are those with a good chance of being toxic. I don't feed onions, raddishes, garlic etc because they are toxic in other animals and I don't want to be see if they are toxic in tort's as well.
Ian