So I'm in buying parts mode for my plywood tank, I have a friend that runs an inline coolant heater for a tractor in his return line on his turtle pond, roughly 300gallon as well. He has that plugged into an aquaponics thermostat. The one that I found at tractor supply is 1¼" in and out, first question is. Could I run something like this or better off with regular heaters, I have a jabao 15000 with around 5 ft of head pressure, I'm pretty sure it's 1½", and don't want to kill the flow. My second question is 1 or 2 return lines? And should I run 1½" all the way to exit?