I have raised three white silkies from chicks. Now they are grown, laying, and seem healthy. Two, however, have had runny poo for a couple months or so. I'm not talking about brown runny caecal poo, it's clear with green/brown chunks in it. They have been fed layer pellets and scratch grains since they were 5 months and they are 9.5 months old now. I have recently added feather fixer to their diet as one of my other silkies is molting and because it is winter. I do not know what could be causing this. One of the hens has normal poop, but the other hen and the rooster have clear, runny, chunky, green poo. Any help?