My tank was given to me used. Some of the paint inside the hood around the MH
lights had bubbled and flaked off by the time I got it. So it's certainly a possibility. As part of my cabinet and hood restoration, I spray painted the inside of the hood with some paint from an auto parts store that is meant for painting exhausts/headers. This paint can withstand very high temperatures. With adequate ventilation (fans) it will stay cool but if you're really worried about it, you could try some of the high-temp paint.