Please help me figure out what to do for my chicks' best health and also my ease in caring for everyone. I plan to buy a few chicks every few weeks as my local feed store gets them, trying to collect a nice assortment of different breeds to raise and show at our county fair in Jan. Of course I want to give them the best care & treatment, but I also want to make their care as convenient as can be for me. I had planned to keep them all together so I don't have many different little pens of chicks to deal with. But I've had to treat the first batch of chicks, now 2 weeks old, with Sulmet for cocci. I had wanted to wait until I had 2 or 3 batches of chicks together and dose them all at once, but one of these chicks had passed quite a bit of blood, so I thought I should dose them immediately. (That one chick died, but none of the others has passed any more blood). Today I brought home 9 new chicks from the feed store. I don't think I should add them to the pen with the 2-week-old chicks, who are on day 4 of their Sulmet treatment. My questions are: When should I add the new chicks to the others' pen? Should I treat the new chicks with Sulmet before putting them with the others? Should I wait until I see symptoms, or just treat them anyway? I appreciate your imput, thank you.