I know I post on here all the time but I would so much rather be safe than sorry. My duckling has just turned 8 1/2 weeks old and I changed up her food a little bit to a more pellet style rather than a crumble, I have been mixing it in like you mix in new dog food slows and little at a time. But since the first new day in this good her poo has smelled awful. For those of you who grew up in the country the smell is almost like Copenhagen chewing tobacco. It’s black and tarry and just absolutely rancid. It’s been about 3 days Now and she only has about one black poo a day but all her poos smell of that nasty smell, the darker the stronger. I thought it was maybe her water boy getting changed enough even though I change it every day. I thought maybe she ate a bad minnow or bug. But to no avail I can not figure it out, Should I go back to her old feed? This one says it’s acceptable for any ages. Or is there something more going on I should be concerned about?