I've read that some people use egg cartons beginning on day 18 and others leave them on their sides. Please give me the pros and cons of each. I am a first time hatcher and currently on day 15. I have 2 standard faverolles and 12 silkies currently on their sides in my 'bator. If I use cartons, should I use foam or pulp and should I make a hole in the bottom for more air circulation? Thanks.