Also watch out because the paint fumes can kill your fish. When I painted my room, I had to leave all windows in house open, and huge fans sucking air away from the tank to keep the smell away as much as possible. Because the fumes are toxic, and their lungs are so small, it can easily kill them, but if you take the right percautions, they might just get a little dizzy. It would probably be worse if there was no pump to give them ozygen, it would stress them even more.
~~Megan