I have the warm spot at 90 with flexwatt belly heat on a home made rack. I think some of this could be the fact that I go back and forth on the mouse size I have been feeding. Between Large Hoppers and Medium mice. Some weeks I think they are overfed and make up for it the following week. The spider I worry because she lost 10 gms in a month but only at 1 time in 7 weeks. She is very shy when it comes to feeding, it takes some work to get her to strike. She never eats if she doesn't strike.