I had one hatched 1 out of three. One stopped growing early and the other one we opened because it was three days late and we thought it was dead. But is wasn't. We found it does take longer. I would wait up to 5 days late. I think because the temp can be off because it is such a small space and you have to open it up to turn it. Plus we were so afraid of getting the temp too high so we had it hover around 100 which I found out later should have been 102. I tried using a combo therm and hygo, but everytime I put it in, it shot the temp up. I think because of the metal and plastic on the thermomter generates it own heat. Also make sure there is enough water in the one leg. The tape thing is a good idea because they will pop the lid off. We just took him out and put him in a box with a light and he is doing great. We did have to go buy him a couple of friend so he could stay warm. My son is trying it again now. Good luck.