Maybe some stickers from fish shops or some taped on decals to show folks you are there for fish and not to carry out a terror attack? Figuring the way folks think is way beyond me at this point!
Just the fact that even the folks here on the forum are more concerned about having a CO2 tank in the room than they are about their grandmother dragging O2 around on a cart, is enough to baffle me. Co2 can be cold enough to burn up, it can get so thick we can't breathe, etc., etc, but the O2 can create such a raging fire that most of us don't want to even think about it!
Fear is not in the facts but the perception of facts, which is what see much of the time!