A 41 quart would be too big for a hatchling/juvenile because it's too much space. It'll stress him/her out and might cause them to go off eating because the larger open space makes them nervous and then causes them to be stressed. ALWAYS! use a thermostat to regulate your heat source! If you can't swing buying a Herpstat or Helix, a lamp dimmer switch will work in a pinch.
These thermostats are fairly reliable and also affordable:
http://www.amazon.com/Hydrofarm-MTPR...arm+thermostat
As far as heat mats, when I had my corn and the two snakes I started with, I had great results with the Fluker's Premium heat pads. They're a little more expensive but give better results in that they don't fluctuate as much with the temperature range and they don't have a sticky pad to them, plus they're thin enough that they don't cause the tank/tub to tip to one end or the other.
Links to the mats:
http://lllreptile.com/store/catalog/...ble-and-rocks/
I'd also recommend you get a hygrometer/thermometer to monitor the ambient temps/humidity in the tub. Walmart sells one that's made by Accurite; it's accurate and pretty cheap ($15 bucks or so) but they don't list in on their web-site is all. I've gotten mine from the home and garden and sometimes the grill/outdoor area of the store, depending on where you're located. Hope that helps.
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