So we are about to build our brooder box for 3 chicks we'll have soon - once the heater has arrived. I see directions that by a certain number of weeks, you need to have dowels in there for perches so that they learn to perch. QUESTIONS - A) does it matter if you have the perch there from the beginning? B) How big a dowel? C) How high off the bottom of the brooder box? And - when you are looking at coops, how high off the bottom should their perches be?