Hello! I have two about two week old ducklings. I have read a lot about niacin deficiencies and the issues to the legs. I wanted to share a photo and see if anything looks concerning (legs, hock joints, feet, etc). They eat and drink a ton. I used for 2 weeks the Dumor one but switched to the purina duck feed. Not sure if I should start supplementing with niacin or brewers yeast since the yellow one has grown a ton! Thank you!