ok, i have planned to buy a thermo for the next setup im going to be buying my pastel next week at the reptile expo.

My question is, i have sort of decided on going with the herpstat propotional thermo, but i see on the spyderrobotics website that there is a herpstat propotional, and one that is "grounded cords", whats the difference?

this will be going on a 30 gallon, with a medium sized head pad, most likely zoo med, and its for only one the one tank.