So I recently purchased my first co2 tank and taprite regulator, getting ready to keg for the first time. I've read that I should test the regulator for leaks by closing the valve that goes to the keg and turn on the tank and see if it maintains the same psi over an hour or two. So today I did my test and after a few hours the psi went from 20psi to 19psi. Is that normal or is this a problem? Thanks so much in advance for your help.