30 gallons sound too large for a 5 month old. How much does your snake weigh? Make sure he has lots of hides and cover. Lack of security promotes not eating. I suggest blacking out the sides and back of the tank with black paper or a back ground.
Your snake needs time to settle down. Leave him alone for a week without touching him. Then offer him food. what size prey are you offering?
You're feeding what down into the enclosure? If its the temp probe, it goes on the outside of the tank, between the tank and mat.
Use tape to secure the cord closest to the probe so it can't move. Don't cover the probe itself or it will trap heat and read inaccurately.
I'd stick with the UTH and try to use that over lamps. Lamps kill humidity.
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