I have a flock of eight they are about 10 weeks old someone in the group has very runny poop. I can't tell which one has it, is there something I can treat their drinking water with? Out of the eight chicks I bought four of them are roosters!!!!!!! What are the odds of that, I'm new to this and all I wanted was eight nice hens!!!!
You might consider separating your cockerels from your pullets (better for all involved and will make I'ding the squirter half as difficult as it is now).
If this continues please post exact description of droppings and answer the questions pertinent to your situation from the thread below: