New bp still won't eat! Not settling in ? Scared/shy ? Pics ...

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I can't attach this 75w reptile radiator to the roof of a tub, think it will melt!
I would quite happily put him in a tub, mat and stat job done ( for the hotspot ) but my house is around 71f now correct me if I'm wrong but I've read numerous times that the ambient temp needs to be nearer 80f?

If you have a hot spot around 90F, the ambient in your house can go down into the 70's. Mine are in a rack, the hotspots are all 87 to 89 most of the time, and my room temps are 70 (at night) to 74 or 75 during the day.