I have a ball python and a few days ago I noticed when I touch him inside his enclosure he feels weird. Like when you stroke a balloon that's charged with static. I've had him for about a month now, Im not sure if it was like that before, but I would I just didn't notice. He feels normal when he's out. If I check the substrate with a test light, it lits up faintly.
I have a wooden enclosure, so my two UTHs are inside.
I have the following layering(top to bottom):
- coconut fiber substrate
- paper
- glass panel
- a small air gap
- UTH
- bottom of the enclosure
There's no potential difference between the subtrate and me if the UTHs are disconnected, only when at least one of them is active, so I figure there's my problem. I regulate both of them with a thermostat and one is toned down with a rheostat to create a temperature gradient. I have one more lightsource on a timer switch but that doesn't seem to interfere with anything.
Teh sockets are grounded, but the UTHs don't have grounding, so I figure it could be the electromagnetic field induced by them. If I touch the substrate with my other hand, the test light won't light up. Also if I connect a wire to the grounding pin in the socket, it doesn't light up either.

Has any of you experienced something like this before? Is it something to worry about, should I fix it with the grounding wire I mentioned? It doesn't seem to bother him too much, but I'm kinda worried.