I had 6 silkie eggs, 4 hatched and are healthy. The other 2 eggs I did the water test, naturally they floated right, there was an air sack. I waited til day 24 and opened the eggs. Bother of the chicks were fully formed had soaked up the yoke and blood vessels and was facing the air sack but just died. What happened? Maybe they weren't healthy but looked like it. I still have 4 healthy silkie chicks.