Thanks so much guys! After I posted on here, I did do some searches. I went ahead and added ACV to the water and because I was already in a panic, did a dish of buttermilk and feed. They loved that!
After that I googled "rust colored poop", instead of "red poop" & found out about the caecal poo! I had no idea- YAY! What a relief; it looks like that's probably what it is. I say that because they don't seem lethargic or sick, and I am not noticing it as much now. So, I am keeping my fingers crossed that they are in the clear.
Thanks so much for your help and advice. I just love the community!