I have been using a Nautilus Aspire tank on a ProVari 2.5, but decided to try out a Kanger Aerotank Mega after reading some reviews. I knew about the diminished capacity and "wasted space" in the tank, but heard good things otherwise. I have to say I do like it. I get good flavor and vapor production. My question is this: Can I keep vaping on the tank when the level of fluid drops below the visible glass? In other words, when I still have fluid in the tank but it just looks like I don't. Holding it upside down would reveal plenty of juice. Thanks in advance for any feedback!