Never exchange a nice, new tank. Take it to a U-Haul or Tractor Supply to refill it. It’s cheaper and they fill it fuller.
Just bought a house with a propane tank? Here is what I learned: how to buy propane
Don't freak out if the tank isn't "100%" full. They leave 20% space for pressure expansion KoppysPropane. To help me narrow this down for you, is this for: A small 20lb barbecue/camper tank ? A large residential heating tank ? Never exchange a nice, new tank