Fat Tailed Gecko Won't Eat

I think the environment change was too much of a stress for the gecko. I hope that he is better now. But it might also be a calcium deficiency. Was the gecko this sluggish before you got him? Or was the change when it came across you? It depends, we'd need to know more information. If it happened recently, its most likely the stress. If it was like this since before, its most likely the calcium deficiency. Depends on his/her past owners and how they cared for him, too. As far as using uvb for a leopard gecko, you can do so. I always have and I even use zilla desert lights too, specifically the T5s. Tubes, not coils. They're pretty good bulbs for day-time desert reps but I don't see the harm in using them for nocturnal deserts reps. As I said, I use them.
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