ok total duck newb. I got 5 lings yesterday. They are supposedly 1-2 weeks old. I mixed up some 18% flock feed last night and this morning for them. No feed stores here have a actual duck feed. Tsc has purina flock feed but it’s about $18 a bag. I’d rather not get that. Do I need to worry about too low or too high protein for angel wing? Also what about niacin? Brewers yeast and peas? Anything else?