I recently found out that my pekin duckling (approximately 2 1/2 weeks old) has this a niacin deficiency. I have both of my ducklings on chick starter feed that states on the bag that it is safe for both chicks and ducklings. But, my little guy still seems to have something wrong with his legs. :,( I read on here that you get the non flush free stuff. well ive been looking for it and i found one that doesn't say anything about being flush fee but it does say something about time release on the front. I asked the pharmacist if this would have the Flush Free stuff in it and she said no. but im still a little wary of giving it to my ducks. Please help! first time duck owner here!