Yeah, they can be active with a red bulb, BG shouldn't have suggested it.(bad BG) although in a large cage it's not that bad(BG has used them). The night bulb will work for yah.
If she only got him a month ago at that size, he was probably a recent import. She probably should have him treated. She is gonna need to boost the temps 24/7 for now though. They like it HOT!!!!!