Baby Boa not eating

[GFLY]

Hi everyone, I’m new to keeping boas. I used to have a ball python so I’m not new to snakes entirely, but I’m worried about my new baby boa... I haven’t been able to get it to eat for over a week, and I don’t know their body language as well as BPs. I also think he’s stressed, because he hasn’t moved from one spot in a few days. I have an under tank heating mat that puts out around 78-80 degrees of belly heat, and a heat UVB lamp on the other side of the enclosure. Theres lots of clutter for him to hide under and feel secure, like fake plants and moss and branches. I’m new to boas, and I’m worried I’m doing something wrong due to him not heating... any thoughts/suggestions?