Min started my Welsummer ( Beatrice) on corid 4 days ago bc of diahrea that was questionable to cocci.... Ivd been out of town and my moms been chick sittin... I noticed there was poo that was runny black dried up. Cleaned bleached brooder last night.... She still has it today. It started out milk chocolate then a tinge if blood now milk chocolate w black... She's drinking and eating but does spend more time sleeping than the others... Plus she's got the head shake going on. I've treated for mites twice... I haven't seen any but I know if they shake their heads it could be mites or lice.... They did have lettuce the other night, grapes last night. But all the others have normal poo and are happy.... Would worms cause this? She's almost 3 wks old and has had diahrea pretty much the whole time I've had her....