I have question that I hope I can get some input. I have two 120 gallon propane tanks on my property side by side. They are connected together with a line. One of the tanks has a line to the house and the other to the garage. One of the tanks feels almost empty and the other fills almost totally full. Since the two tanks are connected together, shouldn't the be balanced in terms of the amount of propane inside? Thank you in advance for your input.