I have 8 little ladies who are 3 weeks old today. When we got them, one (the Plymouth Rock) had a hard poop stuck below her vent but she wasn't blocked up. It seemed that she was having runny yellow poo. In my chicken book it recommended Sulmet's drinking water solution...I can't find that locally though. My local farm store showed me erythromycin but that doesn't seem to be the same thing, and they suggested I hold off on the antibiotics and try probiotics. So I've been doing probiotics in the water since we got them (at 5 days old) and I still see piles of runny poop in the box. It's firmer than it was before and no longer yellow, it's more like a large, soft, light brown poo. Like a gel consistency, not liquid. I can't be sure who it is, if it's still the plymouth rock or someone else. So what should I do? It definitely seems like it's an improvement from before but it's still not right. They all are active and seem healthy and are growing like weeds. I think the only way to get Sulmet's is to order online. Thanks for the help!