You will definitely need a thermostat to con trol the Under Tank Heater. What type of enclosure are you going to be using?...
You may want to make sure that you get digital humidity and temperature gauges. Most use the AccuRite brand. It has a probe and will measure temperatures and humidity. You can get it at Wal-Mart in the hardware section or Lowes, Home depot in the out doors section for about $12-$15 each...