Ok, so im heading to the feed store, and wanted to know what to get my ducks, ive had them for about a 10 months, but ive only been giving them cracked corn, and i know thats a no no, but we just got some extra money, and i want to get the right stuff, should i get cracked corn crumble and grit, then mix it together, and then oystershell on the side, they arent laying yet, but i think they are close, the muscovies are starting to fly...so is that good? tell me what i should get that isnt pricey and that is at every feed store! Thank you!!