That is too low for a day.
Yes tonight try to feed him ( annoying) to start with, if it is not happening force feed, but one chunk of nightcrawler ( length equaldistance between eyes), coated with reptiboost only.

When you get lamp or uth( attached to the side) make sure you dont have huge temp jump. From 75 go for no more then 80 ( day) and then you will have night temp drop fir a few degrees and the following day you can go for 82.