Quick summary for those who havent seen my other posts: I have six 6week old chicks who have lost weight. I think its been gradual over the course of the last two weeks. Two weeks ago I gave them Nutri drench. Did that for 3 days then stopped because they were looking perkier. After that theyve been having lots of dark brown loose poops. No blood, no worms. Ive given them egg yolk and yogurt, apple cider vinegar in their water, then yesterday started a de-worming medicine in their water. Yesterday I also took a poop sample to the vet for testing-- and the results were all NEGATIVE! neg for cocci, for worms, for all parasites. What the heck is going on????? Edited to add: this dark brown poop has been going on for the entire two weeks theyve been off the Nutridrench.