Hi I'm raising incubated chicks for the first time (always had a mother hen before) and I thought I had it all covered! But the brooder is set up, the heat lamp (which I borrowed and has a clear white light) and the chicks are happily installed. But its now evening and I'm unsure whether my chicks need darkness at night. Obviously I can't turn off the heat lamp, but I could cover the brooder with a tea towel? Also not sure how much / how often to feed them? Thankyou!