Baby short tailed python not eating

[Andiamo]

how do I raise a plastic tubs temp? I can't do a lamp or anything like that.

before I upgraded to an AP cage, I used a tub, and I had a CHE hanging over one side for warmer ambient temps

the tub you are using it pretty tall so I'm not sure a CHE would have the same effectiveness as mine, but I bet it would raise temps in there at least somewhat.