I have two groups of pullets in separate tractors that I am going to be putting together in one new large winter coop and run. I bought them separately in August and have never wormed or done anything. Should I pre treat the coop or them with anything? What should I be watchful for? There is one roo with the nine RIR and he already comes around the barn to the other six when they are out(3br,&3ee/buff crosses)