I marked mine with sharpie before I read about potential harming of the chicks. I'm hoping it isn't a problem.
EGG UPDATE: I candled a bit yesterday. It's been 10 days. It's still hard to see anything with most of them being brown eggs. I did see several eggs with large dark masses so I'm hoping that is chicks? We won't candle again until day 18, next Monday. Crossing fingers for a few hatchers.
My temps are still varying. 100 on one side, 98 on another. Sometimes those vary to 101 and 97. I'm trying to just think of the average temp between them. When one side is showing higher, I'll swap those eggs for the other side's lower temp eggs, so all eggs get some higher temps. I don't know. It's all an experiment to me! lol