mine that died never had the green poo or gasped for air, Mine that died were tiny compared to the rest but they just never took off like the others.They were weak compaired to the others from the day I got them. My replacements one was so tiny that I thought wouldn't make it but it is doing great and I have not lost any replacements except for one peanut. Which is sad but it wasn't going to stay with me anyway. Mine are 4 weeks and replacements are 3 weeks old tomorrow. Hatch date wise. All fat and healthy and seem like they are on energy drinks lol. I love watching when one finds a piece of shaving that it thinks is something special then the chase is on by all the rest trying to get it. cracks me up.