You can't save them all. I am assuming these are chinese mantids? Often, many of them will die. Even if you could raise 100+ to adult hood you would have your hands full trying to feed and house large mantids like that. Only time I will seperate an entire ooths worth of nymphs is if it is something in high demand. Otherwise I will keep only what I can manage.I would feel bad about not saving them though when I could have tried : ( I wanna save them all : ( So just put them all together until I narrow it down then seperate them and care for them?