I realize this post could go under "Flock management" perhaps, but it's relating to my 4 week-old Cornish Xs...so I put it here. My 2y.o. son Markie helped me complete my auto chicken nipple watering system & installation today. The birds need to figure it out ...but I'm excited to be able to possibly be done cleaning out the other waterers. I had read to have the nipples at 18", but I figured I'd put the nipples at 15" as the Cornish Xs are shorter now. I figure I will raise them to 18" in a week or so. Does anyone have advice re: changing nipple height?