I have a flock of 7 that includes 2 bantam Cochin Roos about 10 weeks old. I lost an older hen to an illness. I started observing their poop more and found round worms. I treated them with Wazine 10 days ago. It seems the poop is better but every once and a while I find poop with a worm in it. I read that worming is hard on the chickens. Also, they are molting. Do I need to worm again? Thank you.