Thanks for the response, that's good to know.

I'm still a little confused about heating, though ...

If I got rid of the heating lamp, put the original UHT on the bottom, and added a second one for the other side, are those two combined going to be able to raise the temperature to the right levels (90 and 80 respectively)?

So far, it seems like my medium sized UHT only raised the temperature about 4 degrees. Is that because it's on the side?