I have just about a 30 degree difference in temperature between my cool and hot side. I have a rheostat connected to 11" flexwatt for a 32qrt Sterilite tub, and an Acurite thermometer sitting on the coolside while the probe is adhered under the substrate (which is papertowel). I'm new and want to do this right, but I'm having such a hard time finding the right course of action. If someone could help me and point me in the right direction, I'd really appreciate it!