Thank you to everyone who has replied. I was able to get nutritional yeast flakes last night and sprinkled it over crumbled soft bread. They were already feed but overnight ate it. I got the B complex this a.m. I could not get it in the weak duckling she was too petrified for me to get the soaked crumbles to her (even after I put it down she wouldn't even look at it. But I did put a large does of the complex in their water. 30 mls. diluted in about a gallon of water, they drink about a quarter of it before I dumped it and give them fresh water. I had to shoo away the stronger ducks from blocking her. She took advantage of the path and made a slow, but fast for her weak legs, beeline to the water where she sat and drank and ate the chopped lettuce I put in it. She's not making it to the food after fleeing with the rest of the flock to the far corner when I put it in the pen. She's stayed in the corner. The pen is big enough for me to separate her with dividers into a 2 x 3 space, with my smaller brooder in it, her own water and her own food, but in order to do so I have to become Godzilla and walk into their pen to set up the wire dividers. Still I can't think of any way to have her close to the medicated food and to stop her from getting run over every time the ducklings get spooked. I hope my next post is about her recovery.