I just got back into it after 50 years,boy have things changed.Back then I had a incubator that looked like a giant cake pan.The top just lifted off,and there was no water.Now I have 2 little giants with still air,I. was going to get a better one next year,but I couldn't get any better results than I do now.I keep one incubator at 100 and one at 99.6.I only turn them once a day,sometimes twice.I also have different weeks in incubator since I was down to 2 hens.It hasn't seemed to matter,they just keep popping out.I am glad this is the last hatch.Ive gone from 3 birds to about 60 with 30 more babies in brooder and another incubator full.I had read that a still air should be kept between 101 and 103,but was scared temp might go up by itself and theres not much room for error. Should I add a fan if everything is working well now?