I have some 7 week old chicks. I have lost 3 in the last week, and I am starting to notice some red in there droping I am starting to think they may have Coccidiosis. I am going to order some Sulfadimethox they have been eating medicated feed will it hurt them to give them this and the medicated feed. What if I am wrong will it hurt them if they don't have it. Any help will be greatly appreciated.