I started my 2-week-old chicks (Barred Rocks and Buff Silkies) on apple cider vinegar in their water - 1 tsp per quart once per day - a few days ago and have now noticed that my chicks, especially my Silkies, have much looser stool. It's dark brown like the Ceacal, but very thin... opaque, but watery in consistency. Has anyone else experienced a change like this? Is it normal? Am I giving too much or too little vinegar? I make sure to give them fresh water at least once and often twice a day since the chicks tend to poop in their water. This is my first experience as a chicken mom, so I'm alert for anything and everything that could go wrong.