We are considering taking a friends 2 ducks. They have been living with chickens & are not getting along. We have a nice retaining pond that is approx. 8' deep when full. It has natural grasses, etc.This year it has been full, but last year it was easily half the size for 2 months in the summer/fall. (We'e only been here a year & half, but probably common to decrease a bit over the summer. We would love to give the ducks a nice home on the pond, but have read that they're poop could hurt the pond. We would get a coop with a run & let them out for a few hours each day. That should be okay, shouldn't it? Thank you.