All 5 of them seemed fine yesterday and then this morning 1 died. She showed no signs of being sick and then I checked on them this morning and she was just laying there not able to move. She died a few minutes later. The others seem fine and are eating, drinking and running around like normal. But I can't relax because the other one was fine too. There is no sign of blood in their stool and I can't figure it out. I went to the feed store and they recommended "save a chick" electrolyte and I also picked up antibiotics. Should I give them either of these things or just wait and see? It's awful not knowing what to do. Can giving them antibiotics hurt them if they don't need it?