Just make sure you select the right one for US tanks. To be honest, I was thinking about your situation a while back and it just came back to me. Where did you source your tank from? Is there a chance that whoever owned the tank previously used it for something other than CO2 and it was never cleared out?
I was just wondering if whoever owned it before you put something like aceteline or something and when you took it to get filled they just put the new in thinking it was only CO2 in it.