So I bought a used BP rack. It has 4 41qt tubs with the heat cord to keep it warm. Even tho we have the room heated the tubs are only getting to low 80s with the johnson thermostat set in the upper 80s. My question is this. Should I change the heat cord to 1ft of 12in flex watt(pr tub), use 40in of 4in flex watt (per tub) or leave it be. Before you say anything When I can Im going to upgrade my thermostat.