We bought our first little ducks yesterday and i have a few questions 1. When can i let them have grass clippings? 2. What kind of things can i feed them and what should i avoid? (I'm feeding them nonmedicated starter) 3. How long do they need heat? 4. how old do they have to be before i can let them have a shallow pan to swim in? 5. I'm useing a chick water and they really make a mess is there any other water's i can use. 6. What type of feeder can i use right now i'm useing a shallow pan ? 7. How fast do they grow? 8. Okay and this one is from my son when can he take them out in the grass for walks?