@Garden Peas I don't think it was coccidia that killed them - they were acting totally fine. None of the chicken chicks got sick at all. They were in a brooder with pine bedding. I didn't see any blood in the poop or anything like that. They should have been warm enough - the temp was 102 directly under their light. No difficulty hatching, no red bellies, not foot problems. They seemed to be eating and drinking but they were being brooded in my workshop so I wasn't able to keep a very close eye on them. No vitamins in the water.
This time around though they will have their own brooder, I'll go with a higher protein feed just in case, I'll put vitamins in the water, and I'll brood them in my garage so I can keep a close eye on them. I really want these guys to do well if I can hatch them.