Yipeee! Ducklings are so much fun! And boy oh boy your not kidding they grow fast! The one thing that I like to remember is that when it comes to ducks, your never done cleaning them! LOL No really, I change the bedding in the brooder everyday, even if it looks clean-it won't be for long!
Have you taken them swimming yet or out in the yard? And as a special treat, mine go crazy for dried mealworms!