I have 3 separate pens for my Anconas. In my big enclosure I have a 10'x4'x18" pool, a 2'x2'x2' plastic utility sink, and a 3' round pool. There are 10 ducks in there and will all get in the big pool together but there is generally 6 or less at once, they dont go in the 3' pool much but they...