So I got the Williams Brewing aeration setup, purchased a Worthington oxygen tank and successfully aerated a batch a few months back on the first attempt. Removed the fitting and stored the tank. Next time I went to use it, tank appeared empty. Screwed in the fitting, no gas. So I went out and bought another tank. Aerated great the first time, removed the Williams fitting. Now I've pulled the second tank down to do another batch, and no go. What's going on here? The tanks say to remove the torch when done. I'm thinking the Williams fitting might be buggering up the tank schraeder and making it leak. Any ideas?