I went out and took a pic of the girls tonight as they settled into their beds. No one poops on the ones below because they have at lest 10 inches between each roost the first one is 18 inches from the wall and all the others are at least 10 inches apart...it seems to be working GREAT for our 25...
Here is a pic of our roosts. WE went with flat rather then round. And the girls love them. They have closer together ones lower to the ground for them when they are still small and the ones up high for later on. (only one of the girls has been to the top yet) We used shelfing that DH ripped down...