Sleeping in the open?

[Malum Argenteum]

He's in a 55 gal bioactive glass enclosure. Bioactive aspect has been going great and functioned even before I got him. I spot clean most waste and the isopods + springtails eat whatever I don't get so it's usually pretty clean.

Not your question, but it is worth mentioning that "bioactive" enclosures do not have any mechanism for removal of direct life cycle pathogens unless these mechanisms are designed in (by heavy water flow and removal of waste water, coupled with bioloads that are many times lighter than most snake enclosures). Many snakes carry such pathogens ( https://link.springer.com/article/10...36-019-06526-0 ).

More related to your question: it is worth considering whether the isopod species you use is contributing to the snake's behavior. Many isopod species are well known to seek out protein rich foods, to the point that some keepers feed their isopods snake sheds. The isopods might be contributing to some low grade stress.

Also related to your question: a better overhead heat source is the go-to for enclosures where the substrate prevents using heat mats underneath. Radiant heat panels are my choice.