I do not consider 2 drops a week a real leak. And I do not store them upright, they are always in horizontal position when not in use. But of course I'd like to have nothing at all leaking.Anyone experiencing leaking may have it a bit underwicked. I don't have the v2, but had the v1, and the only time it leaked was due to an o ring that needed replaced. I have 30+ tanks sitting here and none are leaking. Its a misconception that tanks leak and we just have to put up with it. They don't.