I made an incubator from a fish tank. I put 3 inch think insulation on the outside of tank, a light with a regular household bulb, a couple rocks for added heat, a bowl of water and a fan to circulate the air. My temperature fluctuates from 80 degrees to 115 degrees and I need to figure out a way to regulate the temp in the next couple days before my eggs arrive this weekend. I have one egg that one of my new layers laid in there but afraid that due to the fluctuations of temp that the egg has gone bad. Any advice or recommendations that I can try?