My chickens have roundworms, because I saw them in some of their poop, so I got wazine dewormer. The problem is, is that I have 2 hens and on the label on the bottle it says 2 oz. of wazine for 1gal. Of water per 100 chickens. Should I still put 2 oz in 1 gal. Of water for only 2 hens or what should I do?