I did! He ghosted me. When I explained I could not see the back or bottom, he did not write back. So getting the tank swapped is not going to happen. Steve says it's OK and to look for bubbles. Which we know I can't do. So I have two options. Fill it, ignore it, and maybe I never have a problem, if I do, I guess I have to sue. Annoyingly. Or I start a dispute with all my documentation with my CC company, and get a different tank. None of this sounds fun or something I normally have to think about. I have never had this sort of issue pop up before.