Hello,
Well, we can run over your tank setup to make sure you have everything correct in your husbandry.
What type & brand of
UVB Light do you use, a flourescent tube light or a compact or coil light? What type of basking light do you use?
What are the temps in the tank & what type of thermometer are you using to measure the temps with?
At his age, 2 years old or a little over, it is normal for them to want to brumate or slow down. They do that yearly once they get old enough. If he is maintaining his weight he is most likely healthy enough to brumate. Have his stools been ok, & did you get a fecal done prior to him slowing down?
That is usually my recommendation to get a fecal to make sure he does not have parasites or worms.
Some people do turn off all of the lights during brumation. That is fine if you want to. I prefer to leave a light on to regulate their day & night cycle & just in the case that they may come out & want to bask from time to time. What you can do is turn the UVB off after we allow him to brumate if that is what is going on right now. Then you can leave the basking light on, or decrease the wattage of it, if he is not basking much.
Tracie