Hello, I have a six month old western hognose snake and I have had him for three months. He is in a 20 gallon enclosure, with about five inches thick of aspen shavings. He ate fine for the first three weeks I have had him, then he stopped eating. He maybe ate once every 3 weeks. The last time I've tried to feed him he was very aggressive and hissed. The temp on the warm side is a 32 degrees C. He also always stays on the cool side of the tank and may only come out his burrow once a week. Should I be worried? I appreciate any info. Thanks!