I got these ducklings at TSC a week ago. She said they were a week older then the other ducklings in the tank. I have a sneaky suspicion these ducklings are a bit older then 2 weeks... They have feathers growing on their wings and they are absolutely massive. I know they are pekins. Yes they sleep like this on top of the brinsea ecoglow. The little chicks love it because I think it makes it look more like momma lol. This brooder is an octagon currently with 23in sides, they have plenty of room just the look a bit older then 2 weeks. The chicks resting on them are 3 weeks old.