it's about as big as it's going to get in the egg. So when you candle, it will be mostly dark, if your light is powerful enough you will see them move around. I use a 3 watt led mini flashlight, with one bulb. once they come thru the egg, it's ok to look at them, but limit it, you don't want the hatchling leaving the egg before it's suppose too (very bad). good luck, the wait is almost over, Don