chunkoblue said:Couldn't the vapors get in through the air pump?
then you better stop breathing because you will get CO2 into the tank.
C'mon. Let's be realistic. What is the volume of air in your house in cubic feet? Now spray some Febreeze and tell me how many PPM that is. Now lets talk about the exchange between ambient air in the room and the surface water of your tank.
Sorry if this sounds rough but you are highly overracting. You introduce more bad things to your water when you stick your hand in the tank for any reason.