The substrate is not muddy, I'd say damp. When he was doing it he would burrow then right after he finished that hole he would make a new one, but he stopped doing it two days ago and now stays in one hole. He is being very shy and won't eat in front of me I know he is eating because I'll put crickets in there and the next morning they'll be gone. He completely stopped eating horn worms for some reason. He seemed to love them before. Atleast when I buy the horn worms they don't get wasted if my pac doesn't eat him, but my tomato frog will ferrsure.