I'm gonna try the aluminum foil and then go to the versa top. Partly because Petsmart didn't have the size for my 40B. I also picked up a lamp with a 40W bulb. Hopefully that'll bring the ambient temp up a bit, I didn't want to go with a 100W as I really only have to bring the temp up a few degrees and I don't want to risk it getting too hot. I may be way off base but I guess we'll see.