Through the winter it is going to get pretty cold for my pixie to be comfortable. I have a heating pad attached to the side of the tank, and a plexiglass top (with a few holes drilled in the top for air) to keep in moisture and heat. However, i dont think that it will be enough. Is having a UV bulb above the tank a good idea? Or can the rays be harmful to my pixie?

I have a night bulb that I use for my bearded dragons (its a purple bulb, 75 watts) and was wondering if it would be ok to put above my pixie's tank. The tank is a 20g long and I would only have the light at one end of the tank (the area where he doesn't usually sit).