i'm not sure about the bumblebees. a quick search on the net should show some sort of care sheet that is more extensive than the one you already read. as far as heating goes, it all depends on how you design the tank. i will say this though. a heating pad under a vivarium is a bad idea, since most vivs have a bit of water at the bottom of the tank, due to misting and drainage from watering live plants. as you can imagine, hot glass and cool water are like oil and water, except oil and water won't leave your floor wet.....lol