They're so cute! I only see a few in there which is good because to me, that's about a 2 or 3 day temporary brooder. You definitely want more room aa top, raise up water and feed out of shavings, a better way to regulate heat whether you use a lamp or heat plate/pad. High heat warm up is good for the first day but after that high heat is a killer. Lamps create the dangerous high heat, not plates so alot of people such as myself prefer plates (actually I use a heating pad for the first week indoors and then a plate in my outdoor brooder. Use a thermometer to know what temps you have in there but also watch behavior. Enjoy reading about raising baby ducks and chicks here on BYC, this place has all the info. you need. Good Luck!