We've got a "naturalized" pond near the chicken coop (where the chicks are staying) that we'd like to use for our ducks when they get a little older. It's really just a 4' wide dirty hole in the ground that hold water because the land drains that way. There are reeds, bugs & frogs. What should we look out for/consider when cleaning this up a bit (cutting down grass, etc.) to make it suitable for the ducks?