I have ducks in my incubator that are on day 17 and some on day 5. I have a few questions: 1. On what day do you candle duck eggs? 2. What day do you take them out of the turner? 3. What do you feed them if you can not find un-medicated chick starter? 4. How old do they need to be before letting them swim? I have candled the eggs that are on day 17 and they are growing. I have also candled the eggs that are on day 5 and I see nothing. How long does it take to be able to see veining? Advice alway's welcome!!!