That is a great after photo, surface looks great. Problem with ducks/geese is they tend to bring stuff like duckweed and worse watermeal in. Only ducks I like are Daffy and Donald. If the rest got a case of fast acting lead poisoning would not hurt my feelings. Will they eat leeches? I don't think that is up there and thier food preference chart. They prefer seeds and millet. Depending on what type they are, daubers especially. Diquat can be harmful to birds. I try to avoid collateral damage when spraying if you must ask. But I would not want my pond to be a haven for waterfowl either.
