Hi, I noticed this morning when cleaning poo out of coop which I do on a daily basis, that there was a stool that looked like it was a bit red and the pine shaving that were attached to it were a rusty red color. Could this be something to be concerned about. I have 6 hens and they all seem to be fine, not seeing anything that makes me feel they are sick. They were on medicated feed for 5 months and just changed over the past couple of weeks to a laying feed. I have heard that it is good to put organic apple cider vinegar in there water. Is there any merit to that. Thank you Kim