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Hi Caroline, What you are thinking, and what Lenny is substantiating should work out well — this effectively will keep the air on the surface of you water, insde the bags, semi-pressurized so that the room air with paint fumes cannot access your tank water. You should emphasize to the painters that its imperative for any aquarium pumps to be running at all times.
A word of caution, since I’m not exactly sure of what you mean by “outside air,” if you’re living in an area of the county which is still experiencing rather cool weather for this time of year — do not under any circumstances draw air from the outdoors. This can and will slowly cool your tank water down, especially as these tanks will now be insulated from the temperature of the room (being enveloped within a bag of cool air) not to mention the cooler air constantly rising up through the water column — and can possibly overwhelm your heaters’ capacity. If you need to be concerned about any possible cooler weather in your area, you will need to draw air from another (distant) part of the house that will not contain the effects of paint fumes and which will still stabilize your temperature. Ray
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