Keep the hides in there when you feed and as said above make sure your feeding in the dark. It very well could be related to the bigger tub but keeping the hides in there while feeding will give him more security and he may eat, if not put him in a size in between or old one.

I have to ask since I see it in the pic, are you using that analog to take your temps? I'm assuming your using a uth and you should use a temp gun or thermometer with probe, best IMO is the acurite 00891. Those analogs are really inaccurate. If you are using a digital with probe or temp gun then disregard this.

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