I am attempting my first incubation with a homemade styrofoam cooler bator! I cannot seem to get the temperature to stablize. I have a small CPU cooling fan and a 25 watt bulb in the bator. The cooler is not a real large one, kind of medium sized. The temperature goes up and then goes down. I have small holes to cool it to the right temp, it stablizes for about an hour then drops real fast by about 5-6 degrees. Can someone give me a few tips on what I should do. I want to hatch my silver phoenix eggs, but I don't want to cook them!!