Almost 2 week old Ancona duckling is scanning with her head (slowly back & forth), walks in circles, acts like it can't see or is dizzy. Eats and drinks and gets around, but a little more clumsy than the others, and is quick to lie down. I'm guessing niacin or thiamine deficiency? I've been putting brewers yeast on their food and feeding green peas. Trying to make sure this one gets it's fair share of the peas but I'm going to pick up a bottle of liquid b complex in the people vitamin aisle since it seems to be getting worse. Anyone know how much I should give her? Just a drop in her bill? Or seperate her and put it in a dish with peas? She loves peas!