Ok thank you! I have no idea how long it's been going on honestly. There was a feeder in front of their feeder (on the outside of their pen) so I did not see what was in there...I mostly checked on them and their water level and I could tell there was something in the feeder by the shadow towards the top. Hope that makes sense. It could have been days. I feel awful that I didn't notice until today when one died that something was awry. I put fresh water with ACV in (some places said don't, others said do). I wish there weren't so much advice not matching out there. I was trying to make them vomit but no one will - I will keep trying!See my post--you do not have to withhold food.
I hope the get better soon!
It takes quite a few days of impacted crop for them to get sour crop.