I am looking into getting a 55 gal this weekend for my sulcata hatchlings. They have grown alot and almost 2months now. My question is, I have a 100w Mercury vapor bulb (UV's/HEAT) and was wondering if I would need to purchase a 150w in order to heat up the 55 gal? I know it will probably take alot more heating to heat up the whole tank unless plexi glass holds in more heat/moisture than wood? I am getting a tank without the top so I need to cover it somehow and right now they are in a 25 gallon and I use foil to trap the heat in and it works GREAT so any suggestions? I doubt I want to foil a 55 gallon LOL