I'm wondering if I need to give my chicks antibiotics. I've noticed their poop is very runny. It was originally hard and we talked to someone at Tractor Supply and they said to feed them chick grit if it was hard, but they would need antibiotics if it was loose. But since we've been doing the grit...it's very loose now. I've stopped giving them the grit. Should they be on some type of antibiotic? I've been putting apple cider vinegar in their water (small amount) and sprinkling a little garlic powder over their food. What else could I do?