There are domestic ducks in the pond down the street from me that someone must have left there, so I am trying to build a floating duck house for them. I am wondering what the best way is to keep it in the middle of the pond so it doesn't float all around and end up at the edge of the water. Do I need to attach a cinder block or some kind of weight to a rope that is then attached the bottom of the house or could I tie ropes to opposite sides of the house and attach them to each side of the pond? Would it tip over if I did that? Thank you to any ideas!