I'll be giving it Brewers yeast. I probably won't give it anything for cocci. I didn't for the ducks I raised last year. It's just had a rough start, and I want to do everything I can to help it if it makes it out if the incubator.
Sorry, I was out sick and didn't see the tags in time... I have never given Corid to any of my Calls, even my fave duck who took 3 days to hatch, lol... what I do if I'm worried about them being weak is give them some nutridrench poultry vitamins... straight drops right on the bill, then a bit of plain water to wash it down... don't force it, just dribble it on the top of the tip or along the edges...
Hope the little one makes it...